Painting fiberglass with marine paint. I wonder if this could be used to on yellowing plastic tub surrounds and sinks?
Restoring shine / not painting
Repairing a fiberglass "hole" in the exterior:
Repairing a "hole" in aluminum. More of a discussion of options with no pics. I like the idea of "repurposing" and there was also an interesting rabbit hole of pop riveting I fell into: