Regrettably my Gtv
was written off
AO Silver Member
Join Date: Jul 2007
Location: New Zealand
County: Papamoa Beach
Problems with GTV bonnet
I'm puzzled by two problems that I have not seen before. My GTV's bonnet (a large moulded fibre-reinforced plastic panel) has an appearance similar to small water spots all over it. There are no such spots on the roof or bootlid, doors, sides, etc. - only the bonnet is affected. I have tried to capture this around the reflection of the light, in the photo attached.
Naturally I first tried a clay bar, then DA polishing with a medium compound. This made the surface very shiny and smooth to the touch, but the spots are visible as ever. The paint is otherwise in excellent condition with no evidence of having been resprayed, only a few minor scratches, and a few tiny chips.
Except, for the second problem - there is a fine orange-peel effect over the entire bonnet surface, more so than for the paint on the rest of the car. The bootlid (concave surface) has some coarse orange peel, as to be expected for concave surfaces. The rest of the car is free of orange peel and I think that's usually the case for 916 Spiders/GTVs.
My thoughts turn to wet sanding, but I'm worried (after inspecting the tiny chips that go through to the white plastic) that there is very little paint thickness on the bonnet. I don't know anyone with a paint thickness gauge that works on this plastic material. Has anyone got any experience with the orange peel on GTV/Spider bonnets and whether it could be sanded out?
I'm getting the feeling that it might be intrinsic to the plastic material and its coating - maybe it has a gel coat as fibreglass does, and are the flaws in that? - but I haven't seen any problems on the bonnets of three Spiders I've had previously.
The 'water spots', examined closely, look like tiny craters in the clear coat.
What do you think is happening here and what can I do about it?
As a fairly drastic measure, is it worth trying to flat the clear without affecting the basecoat and spray a new coat of clear over it? I may have a body repair shop do that, as I'd probably introduce many flaws if I sprayed it here.
If the body shop resprayed the panel from scratch, I'd be worried about the colour match - I think it has pearls in it, though I don't know. The colour code sticker has worn off (as usual for these cars!)
'15 Giulietta 1.4 TCT QV-line, '08 FIAT 500, '08 G Spyder, shell and parts for a '71 FIAT 850 Coupe
Last edited by alexGS; 15-12-15 at 09:45.