Join Date: Oct 2009
Location: Swarthmore, PA
Thanked 89 Times in 79 Posts
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DO NOT use your finger if you're using polyurethane sealant. Isocyanates are very dangerous. You might do OK with it for while, but over time you could build up a sensitivity that causes a severe allergic reaction (rash all over your body, respiratory distress, etc.). Yes, it could happen from just getting your finger exposed.
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1998 Catalina 250WK Take Five (at Anchorage Marina, Essington, on the Delaware River)
1994 Mason 44 Firefly on loan from my BFF (West River, Galesville, MD)
1991 15' Trophy (Lake Wallenpaupack)
1985 14' Phantom (Lake Wallenpaupack)