Selemix 7-538/7-539 2K Polyurethane Direct Topcoat (Economy) is a versatile, 2-pack PU finish, available in five gloss levels, which can be applied directly to a variety of substrates without need for a primer, giving a very efficient process.

It offers excellent anticorrosive properties making it suitable for the finishing and protection of machinery, agricultural and construction equipment, and many other industrial painting applications.

Thanks to its ISO 12944-6 and MED Certification, Polyurethane Direct Topcoat HS is a true all-rounder for many paint jobs in the light industry.

Selemix 7-538/7-539 Polyurethane Direct Topcoat delivers a high performance single layer system, characterised by ease of application, high film thickness, very good adhesion on various substrates such as bare steel, aluminium, galvanised steel and fibre reinforced plastic.

Available in 10%, 30%, 50%, 70% and 80%* Gloss Levels (click to view product) in over 6,700+ RAL, RAL Metallic, BS, NCS and Selemix TIC colours.

*Please note: 80% Gloss product is not suitable for application by brush or roller, or for use on previously painted surfaces. Please see the 10%-70% gloss level products for these uses.

Also available in Standard and High Solids (HS) versions.

For Professional Use Only.

Quick Links - Click To Jump To Section:

• Features & Benefits
• Product Codes Explained
• Surface Preparation
• Mixing
• Application Notes
• Theoretical Coverage
• Drying Times
• Health & Safety

Features & Benefits

• Versatile, 2-pack PU finish
• Available in 10%, 30%, 50%, 70% and 80% Gloss Levels (click to view product)
• Available in over 6,700+ RAL, RAL Metallic*, BS, NCS and Selemix TIC colours
  • *Note: RAL Pearl colours shown are approximations only - matches will not be exact
• Can be applied directly to a variety of substrates without need for a primer
• Excellent anticorrosive properties
• Suitable for application by a wide range of methods including conventional spray, HVLP spray, airless spray or air-assisted airless spray
• Suitable for use on Steel, Cast Iron, Aluminium, Light Alloys and GRP
• Product can be purchased as a Two Component Pack, or as Base or Hardener only - please see the drop down menu
• Also available in Standard and High Solids (HS) versions
• The economy version of this product uses Selemix 9-080 Acrylic Hardener

Product Codes Explained

The base component of Selemix 7-538/7-539 2K Polyurethane Direct Topcoat Economy 80% Gloss is seperated into two product codes which are used to identify white and pastel colours from the mixed colours as below:

• 7-538 - Selemix 2K Polyurethane Direct Topcoat 80% Gloss Base/Binder - Mixed Colours
• 7-539 - Selemix 2K Polyurethane Direct Topcoat 80% Gloss Base/Binder - White & Pastel Colours
• 9-080 - Hardener for Acrylic

This is for colour tinting only, the features of the product are the same.

Please contact our Technical Department on 0113 2455450 (option 2) or send a message to [email protected] for details.

Surface Preparation

Apply only on a clean and dry surface with a temperature above the dew point to avoid condensation. In confined spaces, provide adequate ventilation during application and drying.

Steel (Blast Cleaned):

• Blast clean to ISO 8501-1 SA 2.5 with a blast profile of maximum 40 µm Rz

Steel / Cast Iron:

• Machine sand with P80-120 discs and degrease

Galvanised Steel and Phosphated Steel:

• Abrade with SCOTCHBRITE® and degrease

Aluminium / Light Alloys:

• Machine sand with P240-320 discs and degrease

GRP:

• Machine sand with P240 discs and degrease

Mixing

• Thoroughly mix paint before activating and check colour before use
• The speed of drying can be increased with use of 1-490 Thinner, or 6-550 Accelerator (added at 1-2%) but these can reduce the final gloss and shorten the pot life
• Use of 1-490 Thinner AND 6-550 together is not recommended
• Use of 1-490 Thinner or 6-550 when applied directly to aluminium is not advised

Mixing Ratio:

• Selemix 7-538/7-539 2K Polyurethane Direct Topcoat Economy
  • 4 parts base : 1 part hardener 

Please Note: Refer to the Product Data Sheet for detailed information regarding mixing ratios for the relevant binder/base and hardener/activator used.

Mixing ratios between the Standard, High Solids and Economy versions of this product vary due to the different hardeners used.

Please contact our Technical Department on 0113 2455450 (option 2) or send a message to [email protected] for details.

Application Notes

Please see the Product Data Sheet for detailed Application Instructions before use.

Theoretical Coverage

Theoretical coverage at 100 microns DFT:

• Conventional Spray - 4.1-4.2 m²/L
• Air Assisted Airless Spray - 4.9-5.0 m²/L

Note: Please see the Product Data Sheet for detailed information.

Drying Times

Health & Safety

• For comprehensive Health, Safety and Environmental advice, please refer to the relevant Material Safety Data Sheets and product can labels
• THIS PRODUCT IS FOR PROFESSIONAL USE ONLY