Rosco Flamex PA – Flame Retardant Paint Additive
Rosco Flamex PA – Flame Retardant Paint Additive
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Rosco Flamex PA is a professional flame retardant paint additive designed to be mixed into water-based paints to create a flame-retardant paint layer.
Unlike spray-on flame retardants used on raw materials, Flamex PA works within the paint coating itself. This allows scenic artists and production teams to maintain their chosen paint system while adding flame retardancy to the finished surface.
- Adds flame retardancy to paint films without changing the paint system
- Compatible with many water-based paints and scenic coatings
- Maintains the colour and finish of the paint
- Simple ratio: one full jar per 1 gallon (3.79L) of paint
What Flamex PA is used for
Flamex PA is designed for situations where you are already painting a surface and need the finished paint coating to be flame retardant.
- Latex house paints
- Water-based scenic paints
- Rosco scenic paints
- Latex primers
- Acrylic glazes and clear finishes
- Water-based mural paints
This makes Flamex PA a common solution for scenic murals, painted stage sets, exhibition builds, theatrical scenery and film set construction.
Important: Flamex PA treats the paint layer, not the substrate
Flamex PA slows the spread of fire across the paint coating. It does not change the flammability of the underlying material itself.
If the raw material requires treatment, a dedicated substrate flame retardant should be used instead.
Which flame retardant should I use?
Different materials require different Rosco flame retardant systems depending on the application.
-
Paint systems and scenic finishes:
Flamex PA – flame retardant additive mixed into water-based paint. -
General scenic materials (wood, fabrics, paper, etc.):
Flamex MC -
Delicate fabrics and lightweight textiles:
Flamex DF -
Rigid foam props requiring a hard protective coating:
Rosco Foamcoat -
Flexible foam props requiring a flexible coating:
Rosco Flexcoat
For a complete explanation of Rosco flame retardants, see:
Technical Information
| Product Type | Clear flame retardant additive for water-based paints |
| Mix Ratio | One full jar per 1 gallon (3.79L) of paint |
| Coverage | Approx. 300 sq ft per gallon of treated paint (≈ 28 m²) |
| Minimum Dry Film Thickness | 4 mil dry film minimum |
| Application | Apply treated paint by brush, roller or spray |
| Typical Use | Flame-retardant paint layers for scenic finishes and murals |
Application Guide
- Add one full jar of Flamex PA to 1 gallon (3.79L) of water-based paint.
- Mix thoroughly until completely combined.
- Apply treated paint with brush, roller or spray.
- Ensure the finished paint film is no less than 4 mil thick.
The effectiveness of Flamex PA depends on both the additive and the thickness of the final paint layer.
Cautions & Disclaimer
- Always test Flamex PA with your chosen paint before full application.
- Flamex PA should generally not be used with metallic paints, as metallic pigments may react, tarnish or corrode.
- However, it is compatible with Rosco Metallix paints, which are formulated for scenic applications.
- Store Flamex products in non-metallic containers where possible.
All technical data, recommendations and service are accurate to the best of our knowledge. Rosco assumes no responsibility for results obtained or damage incurred from use since method of application and use are beyond our control.
