Cottontop said:
Has anyone here done their own work to refinish a hardtop ?
Many thanks to those who responded.
When I first asked the question, I had a 50 year old 4-seater hardtop with 3-4 layers of primer and different colors of paint and hand size areas of bare fiberglass.
Within the bare areas and extending under the paint layers are a meriad of spiderweb and other cracks. These cracks appear to be limited to the gel coat and not seem to extend down into the fibers.
I was seeking an answer as to how to remove the multi-layers of primer and paint so that I might repair the cracks and refinish the surface.
Not wanting to use stripping chemicals, as they melt the gel coat and would contaminate any newly applied resin, and knowing that spot sanding would probably overly scollop the surface, I resorted to my old tried-and-true method of using a heat gun and a sharp edged putty knife.
I have now removed nearly all of the paint and primer with no nicks or damage to the surface. My plan is to route out all of the cracks with a 1/4" ball-burr and high speed air motor, then to apply several layers of long-chain (high strength) resin to the surface, forming a new gel coat.
I'll then apply several new layers of glass cloth and resin to the INSIDE of the top before spraying the entire inside with expandable foam. The closed-cell foam will not only supply insulation, but structural strength as well.
Primer and paint is fairly straight forward. I will be re-painting the car at the same time.
After contouring the inside surface with a sanding block, I'll install an overhead "swivel lens" dome light and an adhesive backed headliner.
That should keep my A/C in and the Texas heat out.
Thanks in advance for your thoughts/comments ?
Tim