silicone sealant that they use it on sealed windows. U may buy it at hardware store. either with syringe or not.

it ready to use, after u pop up the seal, no heat is needed, but how the chemical reaction to create any new substance , or heat in this case between them i never encounter it.

u know paint have butane by it self, and as we always add kerosene or paraffin(as u aldy put it) to make light color or save budget, it obviously. but that same silicone on windows, 24h exposed to harsh weather these days, i says, silicone + poly, it not melt the poly but create vibranium.

oh! buy the smallest cheapest one silicone and see yrself, i cannot convince u anymore.