3M Fire Barrier Moldable Putty Stix MP+, Red, 1.45 in x 6 in

I use this for blocking holes in engine firewalls. It molds easily around cables and wires and sticks well to block the holes. I have not checked its fire resistance. After a year it is still flexible and stuck in place. Does the job of blocking fumes from making their way out of the engine compartment.

Very easy to work with. A little tacky on your hands so maybe wear some gloves. Its a block of putty. Fill the holes and make your inspector happy.

Es para huecos pequeños no se adhiere la superficie si esta sucia procura comprar de más para que no tengas este inconveniente

Very workable and hopefully flame proof putty. Easy to work with and good to put a temporary seal around air drafts.

This is the Ul/CSA certified stuff that works! I was rebuilding a Suburban RV furnace and needed a fire/heat certified putty to replace the 30 year old stuff used to seal the fuel gas supply line between the heat exchanger and blower enclosure. This is a fire safety item and I did not want to trust the foreign-sourced material. I was delighted to find this 3M product here on AMZ. Genuine 3M quality sticky stuff that seals perfectly and likely to endure another 30 years. I had to look up the word 'intumescent' lol. Oh, yeah, just what is needed.