No, Zinsser Watertite isn't recommended to be over-coated with plaster or render.

Zinsser Watertite works best when applied to bare masonry surfaces, we would recommend removing the old paint prior to application.

If the existing paint/plaster cannot be removed back down to a bare substrate such as brickwork, blockwork or concrete we would recommend Coo-Var Anti-Damp Paint.

Unfortunately no, this product should only have a maximum of 2 coats applied to a bare prepared substrate for the system to work.

If the product is applied only to a certain height, this will cause the system to fail as moisture getting in behind the coating will spread and form where the ridge will be at 1m high.

While this product can hold back 34psi of pressure when applied to bare compatible substrate, due to the porosity of breeze blocks this may not solve the issue.

Please can you provide more information and pictures of the internal and external areas in question to [email protected] so we can assist.

For application to clean, dry, sound brickwork below a damp proof membrane we would recommend to use a bitumen based paint such as Tor Non-Tainting Bitumen Solution

Yes assuming the brick wall is bare, clean, dry and sound this can be applied.

Unfortunately no, this product should only be applied to a bare substrate such as brick or block work.

Unfortunately no, this product would not be suitable for application to a plastered wall or a concrete floor.

Assuming the plastered walls are clean, sound and prepared as detailed in the technical data sheet we can recommend Coo-Var Anti-Damp Paint for this application.

For the concrete floor assuming you are looking for a surface applied damp proof membrane, the floor is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend N-Virol Superseal Plus Damp Proofing DPM Paint.

It has not been tested for this.

It’s designed to handle moist and wet surfaces like retaining walls… rather than hot and dry.

Therefore, it is impossible to say what will happen here.

Watertite can hold back upto 34psi of pressure when applied to a suitable substrate but it is not a tanking system.

If you wish to use Watertite the failed tanking system should be removed first, but addressing the issue of the blown system and reapplying a Sika 1 Waterproofing System would be advised.

This product is not suitable for use on plywood, assuming the timber is clean, dry, sound and prepared as detailed in the techncial data sheet we can recommend Teamac Metaclor Antifouling Primer followed by 2 coats of Teamac Chlorvar Chlorinated Rubber Paint.

This can be mixed to many RAL and BS colours in a gloss finish, but this is not animal safe.

This product is designed to be applied to a bare substrate such as brick and we would not recommend it is applied to plaster or render.

The cause of the leak must be addressed and the substrate allowed to dry prior to application of any paint.

At this point assuming the wall is clean ,dry, sound and prepared as detailed in the techncial data sheet we can recommend Coo-Var Anti-Damp Paint.

This contains an active reagent that will aid dealing with any remaining surface moisture, but this will only be a temporary solution and will ultimately fail unless the leak is found and repaired.

It can also be overpainted for decorative purposes.

Watertite is designed to aid dealing with moisture travelling through the walls when applied to a bare substrate.

As you mention condensation you may want to consider Coo-Var Anti-Condensation Paint.

Assuming the bare cement render has cured for at least 30 days, the substrate is clean, sound and prepared as detailed in the technical data sheet it can be applied directly.

No the efflorescence must be removed prior to application of Watertite.

Zinsser Watertite works best when applied to bare masonry surfaces, we would recommend removing the old paint prior to application. 

If the existing paint cannot be removed back down to a bare substrate such as brickwork, blockwork or concrete we would recommend Coo-Var Anti-Damp Paint.

Assuming the source of the damp has been fixed, we can recommend Coo-Var Anti-Damp Paint as this is efflorescent resistant and should stop the crystals coming through the paint film.

No, we would instead recommend Smartkote Safekote.

No, we would instead recommend our 402 Damp Proof Coating.

Zinsser Watertite produces a beautiful, bright white eggshell finish. If desired, it may be topcoated with any quality paint, but will nullify the mould and mildew protection portion of the Zinsser warranty. To maintain the warranty, instead use Zinsser Perma-White Interior which can be tinted to nearly any colour and is available in a Matt or Satin finish. Allow a minimum of 14 days before painting.

The response provided to John (copied below for your reference) is our only offering for this issue.

"Zinsser Cover Stain has been used in this situation to block the rust stains however there is no guarantee how long it will hold the stains back. As soon as any trace of moisture gets into the metal beading the rusting process will start again and stains are likely to bleed through once more. It would not be possible to say how long the primer would hold the staining back.

Applying 2 coats of the Cover Stain will give a little more protection and hold back the staining for longer than 1 coat. The Cover Stain can be overcoated with a standard masonry type coating. Please note that the only 100% effective way to solve the problem would be to remove the affected angle beading and replace with new stainless steel or plastic beading."

Zinsser Cover Stain has been used in this situation to block the rust stains however there is no guarantee how long it will hold the stains back. As soon as any trace of moisture gets into the metal beading the rusting process will start again and stains are likely to bleed through once more. It would not be possible to say how long the primer would hold the staining back.

Applying 2 coats of the Cover Stain will give a little more protection and hold back the staining for longer than 1 coat. The Cover Stain can be overcoated with a standard masonry type coating. Please note that the only 100% effective way to solve the problem would be to remove the affected angle beading and replace with new stainless steel or plastic beading.

Zinsser Watertite is a cheaper option than tanking and should work in this situation. It needs a sound masonry surface to bond to, all the plaster must be removed back to the masonry substrate. Apply the Watertite directly to the render surface, no primers or stabilisers should be applied. Be sure to read the products Technical Data Sheet carefully and advise if you have any other questions.

Zinsser Watertite works best when applied to bare masonry surfaces, for your application you may be better looking at Rust-Oleum Mathys Durbocem or Coo-Var Anti-Damp Paint. The source of your water ingress should be remedied ASAP.

Zinsser Watertite should be OK for this job, this is the type of situation the product is used for. It can be applied to damp surfaces however these must be clean, sound and any previous paint coatings well adhered. Any gaps in the mortar joints where the water is leaking through will need to be patched up with render. Refer to the Technical Data Sheet and follow all the steps regarding preparation and application.

No, Zinsser Watertite should not be applied over existing coatings. Instead see Coo-Var Anti-Damp Paint.

No, you would need to use instead something like Rust-Oleum Tub & Tile Refinishing Kit.

2 - 3 coats at 2m² per litre, per coat.

This is a fairly common question and the answer is Zinsser Watertite is definitely not recommended for this situation. You should ask the supplier of the plasterboard if any special treatment is required before tiling over, but we would expect you can tile straight over the board.

This product is available in 5 litre or 10 litre tins.

Zinsser Watertite has a unique solvent based formula that combines a state-of-the-art waterproofing resin with Portland cement to create a coating that stops up to 34psi of water pressure. It can be used internally and externally on walls.

Zinsser Watertite can be mixed to most pastel shades and produces a smooth, eggshell finish. But, if desired, it may be over coated with most good quality paints, but this will nullify the mould and mildew protection portion of the Zinsser warranty. To maintain the warranty, use Zinsser Perma-White Interior or Zinsser Perma-White Exterior which can be mixed to almost any colour required in a variety of sheen levels. Whichever method is chosen, allow a minimum of 14 days before over-painting.