I usually dry sand wood and wet sand metal.
Fiberglass I try not to sand - but when I do it's dry sand for the course grits and wet for the finer grits. Fiberglass I always seem to start out with a grinder so the decision is made for me. Wear rubber gloves and breathing protection. When you get fiberglass splinters use duct tape to pull them out. Don't take a hot shower until you do.
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Al Johnson
34' Marine Trader
"Angelina"
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