FYI, by "sealant" do you mean the silicone aquarium-type sealant? It gives off highly-irritating acidic (vinegar-like) fumes & can take LONGER than a week to cure, depending on how thickly it's applied. It dries slowly from the "outside" meaning the thicker you apply it, the longer it takes for it to dry all the way through. Remember our snakes have a more sensitive "nose" than we do.
Cleaning- wiping sealant won't make it cure any faster- only time & ventilation will.
Heat panels are known to off-gas when new- most ppl say they break them in on high heat to get rid of the odors before ever using them with the snake in residence.
Substrate- who knows? Possible, I guess, but that wouldn't be my first guess. Sealant & heat panel are tied for my "first place" guess.![]()