Re: fiberglass delamination
Very sorry to hear of the bubbles. I'm not an expert in this area, but do have two Sonetts and have been around a
bunch more. Do you have the dreaded "ostrich bumps" as they are sometimes called? Small bumps that appear,
more prevalent on the flat surfaces? Some Sonetts have a really bad case of them while others never seem to
develop them. I'm told they are the result of a gelcoat problem in which the ends of the fiberglass fibers
tend to poke out, creating the bump.
I bought my '74 Sonett about 3 years ago and it had a clearcoat problem, so I took the finish off using a D/A
sander- the clearcoat, the color coat, and the primer. I found a brown body putty underneath. I ended up
tracking down one of the car's previous owners. He rescued the Sonett from a junkyard and it had a bad case of
ostrich bumps. He took it to a body shop and they recommended using this particular brown body putty to
prevent the fibers from sticking up. He described it as a very labor intensive job to apply and sand down the
putty, and sort of wished he hadn't gone that route as it cost a ton of money by the time it was done. In the end
however, no more ostrich bumps.
I'm afraid that's all the help I can offer. I'm sure others on the list have dealt with this in a
better,cheaper way. Or maybe talk to a body shop that has experience with fiberglass cars (Corvettes for example).
Best of luck to you!
eric in vermont
--- In vSAAB@..., Mark Barber <msbarber12 <at> ...> wrote:
> After spending more than 2 years preparing the '68 Sonett for paint, it was
> painted in Sept 2010. It looked really good, especially after the 3M denibbing
> process of wet sanding and 3 bufffing & polishing steps. Last week the sun
> finally came out, and the car was inspected for fine swirl marks. This is when I
> noticed numerous "bubbles" in the paint on the hood bumps. Today I cut one to
> see what happened. The primers and paint came off with a thin top layer of
> fiberglas, leaving a "hairy" fiberglas finish behind.
> I would assume this thin layer is some type of "glecoat" that was applied over
> the fiberglas. What can be done to correct this problem? How can I be sure I
> find all the "bubbles"? If someone could educate me as to how the fiberglas body
> was made, I will sure appeciate it.
> Thanks, Mark