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Old 05-23-2018, 12:23 PM   #39
CEC
Senior Member
 
City: SF
Join Date: Apr 2018
Posts: 125
Sanding before gets the top edges cleaned up so the caulk has clean wood to stick to at the top edge. With old residue or crud on the top edge you might not get a good solid bond at the top. I don't think its necessary to sand the whole board, but if you just do the tops of the edges you risk making a valley on each seam. It could wind up making even more sanding to try and get things flat.
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