tr7triumph.com

Hi guys, this issue isn't specific to wedges but help from a restoration specialist would be appreciated. I took my car into a local paint shop 4 years ago for a bare metal re spray but only 4 months after completion the paint started to split and peel off the car. I had a protracted battle with the body shop but a couple of months ago I won the court case and work has begun to re paint the car. Yesterday using a 36 grit disc I removed all of the paint and filler on the bonnet but as I got to bare metal the steel had a black finish to it and the disc barely touched it. No matter what we used we could not get to shiney clean steel. This was on a bonnet and it was all over and not localised. The body shop the car is now in had never seen anything like it and neither had I. The only thing it resembled was when you use a rust inhibitor like jenolite on steel and it turns black. Could it be a result of the previous respray and a coat of aggressive etch primer. We are truly stumped.

replacement panels come with a black primer but this usually falls off! some good quality panels do come with a black etch primer though.

You say that a 36grit disc wont touch it, have you tried a 7" sander and the 36grit on it, if not try this on one of the corner, but be careful as you can easily distort the panel.
(Are you sure it isn't a fibreglass bonnet Oh that was uncalled for
Sometimes the DA sander is not enough to remove the black factory primers. Different manufacturers use better quality paint than others, some get it at a lower price for good quality etc etc etc...............
Let us know if you succeed with this predicament

When a car has a long long session in a panel shop (like 4 years) it can quickly become contaminated with different products and chemicals that float around in the air from other types of paint, fillers, silicon's (although not the painters best friend) and even certain hand cleaners, not to mention your own hands. These can fix themselves to the car body and some degreasers don't remove 100% of this causing long term effect on the finished paint work.

Never say, 'There's no rush' when you take your car into the paint or panel shop. Then again never say, 'I want it back yesterday'