I read in one of the threads that someone used penetrol on their motorhome to restore the fiberglass finish. I looked up penetrol and this is what I found:
---Makes exterior acrylic paint stick
E-B® Emulsa-Bond® is a stir-in latex/acrylic paint additive formulated for exterior paints intended for wood, masonry or aluminum siding surfaces. It's ideal for chalky or dusty surfaces, or any surfaces where adhesion is a concern. E-B Emulsa-Bond stirs in easily without altering the original finish color and eliminates the need for primer.
Where To Use
• Fomulated for exterior wood, masonry, aluminum siding or porous surfaces.
I'm not so sure I want to put this on my motorhome;