Hi! I'm new and I'm hoping someone can help with my question. We pulled out our old wood firebox and just had a new gas fireplace installed in the same enclosure. The new fireplace vents out the back, it does not use the old chimney that has since been blocked off. The installers used red caulk around the new venting inside the enclosure, to seal where the metal meets the wall, etc. I had noticed there were gaps where the sealant hadn't filled in so when they came out again to fix the new gas line (they had pressurized the line and the pressure had dropped) we had them add more caulk. But after the guy left I had been looking at it again and found new gaps I didn't notice before and therefore, hadn't been brought to his attention. I didn't want to keep bugging them to add more caulk (I'm not sure how critical it is to seal all the gaps) and we were concerned that it would need drying time before they finish the install (inspection was today) so...I went to HD and asked for heat safe caulk to seal between the vent pipe and the wall. I filled in the gaps but now I'm convinced I've used the wrong product (different consistency than what the installers used) and my whole house will go up in flames :red:. I don't know what they used but it's red. It was smelly when they first applied it. And it is shinier and smoother in consistency than my stuff...silicone maybe. I used 3M Fire Barrier Sealant. It is indeed red but not really smelly. It's rated for 4 hours. It's latex and intumescent. But I can't find any info on it's temperature rating. Is my stuff okay to use? And if not, can it be fixed? Sorry for the rambling. I blame the late (early!) hour. Thanks!