
I've worked with pure butyl as tapes and sealants and know what that looks, feels and smells like. Despite claims of consisting of butyl, Siless smells of roofing/street tar. While the majority of this product may be butyl, it is not 100%. I will avoid adding this to an interior compartment in concern for smell. I also wonder if this will creep under heat. It seems much more soft after heating than 100% butyl.


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