Cleaning off a bad silicone pour

[SeanF]

So, I'm trying to make a silicone mold to cast replacements for a couple of lost parts, and either I screwed up the catalyst proportion or the batch has expired, because it didn't quite cure. I have silicone of the consistency of slime stuck to my parts that won't just peel off. Does anyone know what manner of solvent would remove this gunk? (without damaging the plastic, of course)

- Sean F.

[Timmy C]

Maybe silicone remover meant for caulking: https://www.canadiantire.ca/en/pdp/dap- ... 0809p.html

[Admhawk]

Isopropyl alcohol 99% might work if the silicone is still liquid enough. Might be hard to find at the moment, though.

[MM2CVS9]

The Best Way to Remove Silicone
Silicone digestants aren't common. Most painters and handy people rely on brute force to remove silicone caulk. They cut it with a sharp knife and pull it off and then use the knife to scrape off the residue.

A store-bought silicone solvent generally works by expanding the caulk, which helps loosen the bonds holding it to the surface to which it's clinging. Vinegar and isopropyl alcohol will also do this. The best way to remove silicone caulk short of using a digestant is to treat it with a silicone sealant remover, WD-40, vinegar or alcohol, wait for it to soften and then attack it with a knife or paint scraper.