On my 30+ the companion way sliding hatch is a big piece of translucent plastic that you grab by a big chunky piece of teak on top. There is also a big piece of teak on the bottom side that holds the locking hasp. To refinish that piece should I try to remove it? Or just refinish it where it is? I can see plugs so there must be screws. But is there also glue? I'd like to remove the old varnish with a heat gun, but will I melt the plastic? Would blue tape be enough to protect the plastic.