magillaru Posted November 14, 2014 Report Posted November 14, 2014 Any difference between the white and black polyurethane (pl 640 vs pl 630)?Besides the obvious of what it says on the bottle....the white (640) says it specifically adheres to wood so I got that but Ive seen people use the black (630)....just wondering if there's a reason or greater benefit between the two? EDIT: regarding terms of use - sealing inside seams to make sure it's airtight. NEVERMIND.....going to make a wood + sawdust mix and seal with that. Singer Alternators Team Asshole #anothershittysingerbuild
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