Spread of Flame paints/materials

[andy_]

In the manufacture of shop interior fittings & panelling :

If you take class 1 rated MDF, and paint it with ordinary paint, would it still be considered class 1 rated for spread of flame?
If you take ordinary MDF, and paint it with a class 1 rated paint, would it be considered a class 1 rated product? (assuming the whole object is covered in paint)

Or is the only way to ensure class 1 spread of flame is use class 1 MDF and then use class 1 paint?

I have read back a few other topics on spread of flame, and would appreciate any comments on this, or possibly links to sites explaining what is or isn't appropriate to maintain ratings.

Thanks

[wee brian]

The test would be carried out on the paint and the substrate.

If the data for the paint says that it gets Class 1 on MDF then bob's your uncle.

Be careful. lots of treatments are tested on calcium cilicate board so they would not be able to claim class 1 even when painted on to a class 1 board.