I have some PCV blocks about 6 x6 inches square and several inches thick that are part of a frame Im making to support shade cloth over our deck. PCV pipe will go thru three holes drilled in each block to make "cluster legs". The PCV color is ok ,but what should I do about the spongier , less smooth areas where there are saw cuts? Sand and seal with something clear, or paint with something like Krylon Fusion?