Fireproof filler

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Gary111

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Hi, I could do with filling a space where a lock was in a fire door.
Im planning to cut wood to fit, then using intumescent filler round it.

the filler doesnt seem to harden much though, is there something better ?

Ive noticed fireproof cement , or alternatively fire board.

has anyone got any advice on this please ?
 
Car filler is polyester based, so maybe a better alternative could be epoxy putty.
You could deep fill with fireclay cement I guess then skim over the top with the putty - a bit cheaper that way.
John :)
 
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