View Single Post
Old 09-27-2008, 11:29 AM
jmk jmk is offline
Former Paint Maker
Join Date: Sep 2008
Location: Cleveland, OH
Posts: 343
In the US, BASF used the Glasurit trademark only for their refinish. The OEM materials simply went by BASF. So when you are talking about Gasurit finish on your Benz, are you talking about the OEM finish or a repaint? If it is a repaint, that finish you can totally sacrifice w/o losing anything. If it is the OEM finish, then you want to be more careful.

The chemistries of most OEM finishes are acid catalyzed, melamime acrylic based coatings. DB and BMW usually used 2k iso/melamine or just iso curing clears that required oven baking. It was a very complex clear application system, but the final product was superior. Low solids (lots of solvent in the supplied paint) allowed for larger starting materials (larger Mw as I talked about earlier), which provided for superior appearance and durability.

In Germany, there were not significant limits on VOC amounts in the '80's, but there were specific solvents you could not use to reduce the coatings. This was the same in England at the time. It was easier and cheaper to provide a quality finish w/o the VOC restrictions. You can actually tell in the early '90's when the Germans started lowering the allowed amount of solvent in their coatings: the appearance lowered significantly when compared to Japanese cars of the same vintage. It wasn't a cost reduction, it was the physical chemistry of applying high Mw versus a lower Mw of the starting materials. "There aint no substitute for Mw."

The goal is still to preserve as much of the original coating under the refinish as possible. In the OEM world: Herberts was the best. Nippon and Kansai could produce high quality, polluting paints, but their quality was very poor when they had to deal with enviromental regs of any kind. PPG and Dupont and their strengths and weaknesses. The technologies were roughly equivalent. BASF was always the worst OEM supplier. I remember taking a train from Prague to Berlin in '91. I happened to sit with a Skoda (owned by VW at that time) paint shop chemist. We talked about the different manufacturers, and she confirmed tha BASF was the weakest supplier in Europe as in the US. They are a much better refinsish suppler than OEM supplier.

Hope this isn't too much info, but it gives you the big picture on auto coatings.
Reply With Quote