Bought this (our first) sailboat last summer. Lots of bad mildew stains because of leaky ports. Finally found something that works wonders on the mildew stains (Mildew Stain Remover - imagine that!). Screws on ports are stripped and plexiglas (I assume it is plexiglass) is badly scared and broken on edges. How do I go about replacing them? Do I have plexiglas cut locally or order ports from somewhere? How do I go about putting in new ones? Need experienced advice. I found the mildew stain remover also worked wonders on the non-skid deck surface. Is there a sealant of some kind I can put on this surface? Thank you ka