+1 on the mast boot idea.
Even simpler, make the boot out of a piece of sunbrella the color of the deck. Put a strip of velcro around the base of the mast just above where the radio cable goes in and another around the bottom piece of trex. Sew velcro top and bottom to a fitted sheet of the sunbrella and put some velcro or lacing where it comes together in back to tighten it up. Tuck the cables under the bottom edge to really neaten up the mast base.
Carl
Even simpler, make the boot out of a piece of sunbrella the color of the deck. Put a strip of velcro around the base of the mast just above where the radio cable goes in and another around the bottom piece of trex. Sew velcro top and bottom to a fitted sheet of the sunbrella and put some velcro or lacing where it comes together in back to tighten it up. Tuck the cables under the bottom edge to really neaten up the mast base.
Carl