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Cromar Rubber Coat Waterproof Coating (formerly Cromar Rubber Coat Liquid Roof Coating) is a brush, roll-on and sprayable high-performance coating that can be applied over many existing surfaces including concrete, wood, brick and metal, forming a durable and seamless waterproof membrane.
- Freeze/thaw stable; Water based; UV resistance - not affected by sunlight
- No VOC’s or solvents; Excellent Adhesion; Easy maintenance
- Resists cracking and chipping; Abrasion/impact resistance
- Flexibility; Organic growth resistance; Paintable; Non-flammable
Cromar Rubber Coat Waterproof Coating (formerly Cromar Rubber Coat Liquid Roof Coating) is a brush, roll-on and sprayable high-performance coating that can be applied over many existing surfaces including concrete, wood, brick and metal, forming a durable and seamless waterproof membrane.
An all-purpose product used on your most difficult waterproofing projects, Rubber Coat contains no solvents, is non -flammable and not affected by sunlight.
Quick Links - Click To Jump To Section:
- Features & Benefits
- Versatility
- Uses
- Coverage
- Application Tools
- Surface Preparation
- Mixing
- Rubber Coat Application
- Cure Time
- Clean Up
- Common Errors
- Tips
Features & Benefits
- Freeze/thaw stable
- Water based
- UV resistance
- No VOC’s
- No Solvents
- Excellent Adhesion
- Easy maintenance
- Resists cracking and chipping
- Abrasion/impact resistance
- Flexibility
- Organic growth resistance
- Paintable
- Brush, roll-on and sprayable
- High-performance coating
- Can be applied over many existing surfaces including concrete, wood, brick and metal
- Forms a durable and seamless waterproof membrane
- Non-flammable
- Not affected by sunlight
Versatility
Rubber Coat provides numerous residential and commercial solutions. Typical applications include:
- Flat Roofs
- Foundation Walls
- Gutters
- Vents
- Ponds
- ICF’s
- Car Wash’s
- RV’s
- Shower Liners
- Containment Areas
- Balconies
- Flashings
- Curbs
- Skylights
- and more
Uses
Designed for use on stationary concrete, masonry, metal and wood surfaces. For interior applications over concrete, masonry, tile, wood and drywall.
Coverage
Varies with substrate conditions and application method/thickness. Typical coverage range:
- 15 – 20 sq. ft. / G (3.78L)
Application Tools
Rubber Coat is generally applied using a roller, paint brush or hydraulic piston sprayer.
Surface Preparation
Surface must be clean and dry, stable and free from spalling, efflorescence, dust, dirt, oils, surface flaking, poorly bonded or glossy paint, sealers, salts and other contaminates which may affect adhesion and product performance.
- New concrete: must be allowed a minimum of 30 days cure time prior to application of Rubber Coat
- New masonry surfaces: should be allowed to cure a minimum of 48 hours prior to application. Exterior surfaces should be power washed using at least 1500 psi to clear any surface contaminates.
- For interior concrete surfaces: scrub with a TSP (trisodium phosphate).
- For wood floor surfaces: Vacuum thoroughly and wipe clean.
Mixing
Contents generally do not need to be stirred prior to application.
Rubber Coat Application
Ambient temperatures should not be less than 5º C, and should not exceed 35º C during application and for a continuous period of at least 24 hours after application. Avoid hot, direct sunlight. Do not apply over coal tar, avoid solvents and solvent type adhesives.
Cure Time
At 25°C and 50% relative humidity, Rubber Coat fully cures in 24 – 48 hrs. Curing time increases with thickness, colder temperatures or higher humidity so environmental conditions must be considered before application.
Clean Up
Equipment can be cleaned with soap and water prior to cure of material. Baby oil helps remove cured product off hands.
Common Errors
Applying product too thick - May cause cracking and skinning over uncured product.
Inadequate surface preparation – May cause adhesion issues.
Applying over saturated materials – May cause blisters from water vapours.
More product can always be applied on itself. Better to do more coats to build thickness then 1 thick coat.
Tips
Wear disposable gloves to help with clean up.
Cover or leave brush in pail to avoid air curing the product if you want to use again.
Data sheet
- Manufacturer
- Cromar
- Interior / Exterior Use
- Interior & Exterior
- Water / Solvent Based
- Water
- For Use On
- concrete, wood, brick, metal
- Application Method
- brush, roller, spray
- Single, Two or Three Pack
- Single
- Pack Size
- 3.78L, 18.9L
- Coverage
- 15 – 20 sq. ft. / G (3.78L)
- Max. Application Temperature
- 35ºC
- Min. Application Temperature
- 5ºC
- VOC
- Ultra-Low (5-49 g/l)
- Fully Cured
- At 25°C and 50% relative humidity: 24-48 hours
- Base Type
- Water-Based
- Suitable For Use On
- Wood
- Suitable For Use On
- Drywall
- Suitable For Use On
- Metal
- Suitable For Use On
- Gutters
- Suitable For Use On
- Flat Roofs
- Suitable For Use On
- Foundation Walls
- Suitable For Use On
- Tiles
- Suitable For Use On
- Curbs
- Suitable For Use On
- Balconies
- Suitable For Use On
- Masonry
- Suitable For Use On
- Flashing
- Suitable For Use On
- Concrete
- Suitable For Use On
- Skylights
- Suitable For Use On
- Brick
- Suitable For Use On
- Ponds
- Application Method
- Brush
- Application Method
- Spray
- Application Method
- Roller
- Usages
- Waterproofing
- Product Usage Type
- Topcoat
- Colour Family
- Black
- Roof Type
- Flat
Andy Watts on 2024-09-05 12:35:48 | Question:
Would this product be suitable to paint onto the inside of Aluminium box gutter ? The box gutters are new aluminium that have been cleared together externally and my client wants an EDPM surface applied to the inside covering the joints ? |
Answer from Rawlins’ Technical Team:
Assuming the aluminium is clean, dry, sound, lightly abraded and prepared as detailed in the technical datasheet, this product should be suitable for application to aluminium gutters to leave a waterproof membrane finish. When applying the self-adhesive EPDM, we'd recommend to test for compatibility and adhesion with this product prior to full application. | |
Helen on 2024-06-06 22:23:38 | Question:
Would this product be suitable to waterproof the floor of my walk in shower? We have tiles and grout but the grout always comes out. Would this be suitable to paint over the top of the tiles and grout to waterproof it? |
Answer from Rawlins’ Technical Team:
Unfortunately no this product is not suitable for this application, please can you provide more information on what the tiles are made of and pictures of the area in question to [email protected] | |
William on 2024-02-04 11:55:22 | Question:
Hello I am looking to use this product on marine ply to waterproof a boats deck would this product be suitable |
Answer from Rawlins’ Technical Team:
No, this product wouldn't be suitable for this application due to the salts and chemicals found in the sea posing a risk. | |
Matt Randles on 2023-10-02 19:23:41 | Question:
Do you supply a paint that will water proof seal an existing epdm rubber roof.. the roof has started to leak a little in heavy rain after 2 years Thanks |
Answer from Rawlins’ Technical Team:
Assuming the EPDM roof is bare, clean, dry, sound and you have prepared the substrate in accordance with the technical datasheet, this product is suitable for this application type. | |
Chris Pegg on 2023-08-29 18:28:10 | Question:
Would this be able to be used on a gazebo polycarbonate roof that has been damaged by hailstones the holes made on penetrate the top skin in places. Is it available in any other colours |
Answer from Rawlins’ Technical Team:
This product isn't suitable to stick to polycarbonate sheeting. | |
Nick on 2023-08-22 10:25:11 | Question:
Hi, I want to paint a sloped wooden roof (gazebo) rather than felt. Would this be suitable? The wood is pressure treated so I know I'll have to dry it out first or is there a suitable primer that might help? Thanks! |
Answer from Rawlins’ Technical Team:
Assuming the wood is clean and dry prior to application, this product will be suitable for this application. | |
george on 2023-08-04 11:23:17 | Question:
can this paint be painted on cement corrugated roof sheet, is 1 coat sufficient? |
Answer from Rawlins’ Technical Team:
Assuming you have a clean, dry and sound prepared substrate, this product will be fine to use for this application. One full coat should be applied in accordance with the application coverage. | |
Roger Arbon on 2023-07-24 14:48:45 | Question:
Hi there can you advise if this is safe for fish ponds and if it will adhere to a butyl liner Thanks |
Answer from Rawlins’ Technical Team:
This product is fine to use in ponds, however doesn't adhere to pond liner. We would advise to wait at least 48 hours after applying before refilling the pond, as this could harm any fish otherwise. | |
David Quirk on 2023-04-06 12:25:39 | Question:
Hi I have a set of steps that run down the side of my property that have been previously coated with a GRP membrane. This has failed somewhere on the flight and has led to water getting into an adjacent structure ( masonry ) that abuts the steps. Looking for a product that can be paint or roller applied over the GRP and up the face on the adjacent wall ( GRP has been dressed up this also 150mm ) which is suitable for foot traffic and could possible be sanded also for additional non slip properties. Needs to look good also :-) |
Answer from Rawlins’ Technical Team:
Unfortunately this product would not be suitable, please can you provide more information and pictures of the area in question to [email protected] | |
steve allen on 2023-03-29 13:45:22 | Question:
hi i have metal steel container and the roof is leaking in places, would this product be suitable? many thanks |
Answer from Rawlins’ Technical Team:
While this product can be applied to clean, dry, sound metal surfaces, it will not bridge cracks or gaps and should not be applied to rust. Assuming the area leaking has any rust removed, and gaps or holes are less than 2mm, it is clean, dry, sound and prepared as detailed in the technical data sheet you could consider Rust-Oleum Mathys Fillcoat Fibres. | |
Eric Caverhill on 2023-03-21 09:34:03 | Question:
To stop corrosion I want to paint the inside of a new cor-ten steel water feature reservoir, that will be filled with water.. Can I use this product ? iIf so what surface preparation is needed before using?. |
Answer from Rawlins’ Technical Team:
For this application to a cor-ten steel water feature, assuming it is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend two coats of Teamac Metaclor Underwater Primer followed by two coats of Teamac Chlorvar Chlorinated Rubber Paint. Blast cleaning to SA 2½ is recommended. If blast cleaning is impractical, mechanical cleaning should be employed but hand cleaning does not clean the steel to the required degree. This can be mixed to many RAL, NCS or BS colours in a gloss finish. | |
John Stuart Green on 2023-02-16 23:18:20 | Question:
Would this product be suitable for applying over an existing exterior tiled terrace of porcelain tiles and then over tiling with new tiles . |
Answer from Rawlins’ Technical Team:
While this product could be applied to the tiles unfortunately it is not suitable to be walked on or tiled over. Please can you provide more information and pictures of areas in question to [email protected] and we can look for an alternative for you. | |
Adrian on 2023-01-02 16:47:16 | Question:
Can this be used on a flat felt roof especially if it is dry and otherwise sound? |
Answer from Rawlins’ Technical Team:
Assuming the felt roof is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend Cromar Allweather Roofing Compound. This is an effective, general purpose roof coating that is resistant to water almost immediately after application, therefore ideally suited for winter use. | |
Mark on 2022-12-30 12:49:34 | Question:
Hi can this be used on a metal shed roof On the inside to stop condensation. Thanks |
Answer from Rawlins’ Technical Team:
No, for this application assuming the roof is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend Tikkurila Grafotherm. | |
Paul on 2022-12-10 15:58:36 | Question:
Is this product suitable to waterproof the inside of a blockwork walled/concrete bottomed new build water feature that is circa 500mm high and 30 metres long. No fish just water feature. |
Answer from Rawlins’ Technical Team:
Unfortunately no this product would not be suitable for this application to a blockwork walled water feature unless the area was rendered first. Assuming this is done, the area is clean, dry, sound and prepared as detailed in the technical data sheet it could be used. | |
ruben hepworth on 2022-11-30 12:02:10 | Question:
can this product be used on on steel frame that will later be poured concrete on. and does it require a coat of primer on the steel before hand |
Answer from Rawlins’ Technical Team:
Unfortunately no, this product is not suitable for this application. Please can you provide more information on the project to [email protected] and we can look into a suitable alternative. | |
Rene Lee on 2022-11-05 16:50:46 | Question:
Can this be applied directly to osb3 boards on a small slightly sloping roof roof |
Answer from Rawlins’ Technical Team:
Yes this can be applied directly to timber assuming it is clean, dry and sound. | |
Steve on 2022-10-01 11:39:36 | Question:
Hi, Can this product be painted on top of a EPDN roof . |
Answer from Rawlins’ Technical Team:
Yes this can be applied to a clean, dry, sound and prepared EPDM roof. | |
Chris De'Ath on 2022-09-03 22:06:12 | Question:
Can this be used to waterproof an external house wall made of brick and painted matt white. I plan to put 150mm of sub base against the wall above DPC , and worried about damp. Is this suitable please.its for a raised patio 6m long that buts up to my house |
Answer from Rawlins’ Technical Team:
Unfortunately no, this product would not be suitable for this application. | |
Charles on 2022-08-30 09:38:21 | Question:
Can this product be used on an old concrete path? The path is itself the ‘roof’ to a disused coal store cupboard below. The path is the main entrance to my property but has cracks and allowing water seepage into the store below. |
Answer from Rawlins’ Technical Team:
Unfortunately this product would not be suitable for this application. if you would like us to assist please contact us by e-mailing details of the project to [email protected]. | |
Alan on 2022-07-25 22:33:18 | Question:
I need to waterproof a wooden base for a marmoset enclosure, would this be suitable without fumes |
Answer from Rawlins’ Technical Team:
This product is waterbased and low VOC, this can be applied to wooden floor areas that are bare, clean, dry, sound and prepared as detailed in the technical data sheet. Please note this has not been tested for any animal safe requirements. | |
david Shearer on 2022-07-13 10:11:34 | Question:
I have built two raised vegetable bed out of concrete block and I want to render the outside, so i need to seal the inside faces to prevent water blowing the render. Is this product safe to use in a vegetable/produce bed? If not, can you recommend anything |
Answer from Rawlins’ Technical Team:
Assuming the concrete blockwork is clean, dry, sound and prepared as detailed in the technical data sheet this can be used. While it does not state it is plant safe, it is waterbased and contains no solvents. | |
Roy on 2022-06-03 16:46:00 | Question:
Need to seal a metal shed against a protruding wooden base. The base is covered with a plastic sheet. Rain seeps under the metal frame which extends by about 12mm onto the frame and there is no obvious gap between the frame and base. The frame protrudes a minimum of 60mm. thanks |
Answer from Rawlins’ Technical Team:
Thank you for the enquiry, we will need more information to assist with this enquiry, please can you send pictures of the area and a description of what you are looking to do to [email protected] | |
Michael Booth on 2022-04-28 15:25:32 | Question:
Hi Would this product be suitable to coat a galvanised steel drum? Also, is it harmful to fish? Thanks Michael |
Answer from Rawlins’ Technical Team:
Assuming the drum is to be used as a fish tank no this would not be suitable. Assuming the galvanised drum is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend the barrel is first prepared with Teamac Mordant Solution (T Wash), Teamac Metaclor Antifouling Primer is applied followed by 2 coats of Teamac Chlorvar Chlorinated Rubber Paint for this application. This is available in many RAL, NCS or BS colours in a gloss finish. Once cured it will not be harmful to fish. | |
Rose Connolly on 2022-04-04 09:06:05 | Question:
Can this be applied over an existing waterproof layer? (A painted-on layer, not sure what it is...) |
Answer from Rawlins’ Technical Team:
Unfortunately no, this product is not suitable for overpainting an existing waterproofing layer. Assuming the previously painted roof is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend Cromar Hydrosil Silicone Roof Coating. | |
IAN CRUTCHFIELD on 2021-11-17 11:07:00 | Question:
Can this be applied to damp wood? |
Answer from Rawlins’ Technical Team:
Unfortunately no, the timber must be clean, dry, sound prior to application. | |
Tom Fanthorpe on 2021-09-14 12:36:30 | Question:
can this be applied over itself to build up thicker layer coating |
Answer from Rawlins’ Technical Team:
It is recommended to apply this in multiple coats rather than one thick heavy coat to build up a thicker coating. | |
George Milton on 2021-08-24 12:07:31 | Question:
Can this be applied to the sides of a manhole made of brick that is partially filled with water when in use ?. The brickwork is solid but has started to crumble in a few places. I intend to empty and then let dry first. If this product is not suitable do you have any others. Thanks George |
Answer from Rawlins’ Technical Team:
We would recommend using a chlorinated rubber for this application as it would be suitable for both above and below the water line. Acid etching would be recommended to prepare the surface, a diluted coat of Teamac Chlorvar Chlorinated Rubber would be applied before another undiluted coat. | |
Mick Smith on 2021-08-09 13:05:02 | Question:
What is the preparation concerning application to Metal |
Answer from Rawlins’ Technical Team:
Thank you for the enquiry, we have contacted you directly for more information. | |
TRISTAN MERRY-HOWE on 2021-06-24 17:07:01 | Question:
Dies it require a thinner if spraying? |
Answer from Rawlins’ Technical Team:
This does not require a thinner and can be applied by brush, roller or hydraulic piston sprayer. | |
IMPORTANT SHIPPING & DELIVERY INFORMATION
Cromar Rubber Coat Waterproof Coating is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.
Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.
Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.
All delivery costs below are excluding VAT