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Welcome to the site Julien.
The biggest thing I look for with intumescent paint is that it has to be tested to CAN/ULC S101 for the given situation at hand. I’ve had it proposed to me for several different situations, some I accepted, some I didn’t. People tend to think it’s a magic solution (can’t we just paint everything?) and often figure out that drywall is cheaper once they see the price of the intumescent paint.
For example: Original door in a historic church? Sure, I’ll accept that. Wood paneled stairwell in an apartment building? Nope, give me drywall.
I have the Owner provide me with all the supporting documents for review before and upon completion require a signed letter of acknowledgement on letterhead from the painting contractor that it was applied as per manufacture’s instructions.
You may also want to check with your Building Department for their opinion as creating new separations technically requires a building permit.