Re: blue tape. It might be OK on teak handrails. But DON'T assume that if you tape it to your gelcoat/awlgrip decks it will come off easily. We taped around handrails/toe rail in prep for a Cetol varnish. The varnish went on, we we're pooped, we left the tape on for an extended period (a month +). Getting it off was a ROYAL pain. We tried every caustic, environmentally harsh chemical we could find including thinner, acetone, 3M glue remover, etc, etc. None would make the stuff budge. It ended up being many, many hours of scraping and polishing to get it off.