fiberglass fenders

Has anyone on the forum ever built their own fiberglass fenders? I have been thinking about this lately, since I decided to widen my tear to 5' and build over the tires halfway. I have some general information regarding one-off and plug and mold construction, but having never tried either method yet, it would be nice to hear from someone that has. If anyone has advice to offer, I would love to hear, particularly concerning how to paint them to protect the epoxy from uv (ie. what paint products are best and how to get a really nice smooth paint job). Not sure how to go about doing this. Also, it would be nice to know how thick to go with the layers, etc... to make them nice and strong.
Amy
Amy