Oh, another cheap DIY,-I guess I hve a lot of "cheap" aboard! I used this heavily tinted piece of polycarbonate (Lexan) over a cut out made in my aft companionway slide. Lots of light below and a replacement of an old worn surface.
The adjacent handrail is Starboard cut to match the former teak piece that was old and this requires zero maintenance. 'works well on classic plastic with the desire for no brightwork.'take care and joy, Aythya crew