Portlight recomendation

[ArteLauri]

We are sailing around the world and came to the Marshall Islands, so we can order in supplies to do work on the boat before continuing. So many portlights to choose from, with little time to review, order and get mailed here, so we can install and have a dry boat! We are looking at molded nylon by Bowmar, for the price and because it wont rust! But will it hold up in the sun and tropics? Any recommendations are welcome. Thanks