Select to expand quote
Mark _australia said..
acetone is really good for dissolving the contact adhesives on boards.
The issue with acetone is that, although it doesn't dissolve the epoxy resin itself, it dissolves the various addons that are added to modern resins (for UV protection, controlling hardening times, controling toxic emissions...), leaving microcracks in the resin that can induce porosities and structural weakness.
I have seen with my own eyes somebody messing up the graphics painted on the blank under clear resin by a removing a tar stain with acetone. Even with this quick application, the acetone was able to go through the resin (though the cracks created) and dissolve the paint on the blank.
BTW it was one of a first board of a then young shaper, Ron House (that by now is a pionnier of SUP shaping), that made a summer internship at Barland to shape some sailboards.
Plus, acetone is extremely toxic, burns the skin, and goes through the skin to destroy your internal organs, especially the liver (which for most of us is already under regular attack of alcohol :-) )
PS: useful trick: when buying a second hand board, ask the owner if you can use acetone to clean it. If he says yes, then don't buy it! :-)