Re: Is paint thinner suitable as a surface prepper?
Joey, for bare surfaces it is best to use an etching wash prior to application of primer. It is even better to use an epoxy primer on bare metal. PPG has an etching wash that works quite well. There are also some etching primers available. Also, I would use a wax and grease remover. As I recall the old PPG designation was something like DX330, I am not sure what it is now. It has been a while since I bought any. I usually use the wax and grease remover, then use the etching wash, then apply an epoxy primer, and the sanding primer over that. As far as sanding primers, PPG used to have one called K200 that was quite nice. It is a catalyzed primer and can be mixed for either heavy fill or light fill. There is another one called NP35, I think that is right. The K200 is a light tannish yellow color and the NP35 is a purplish red. I know these are all PPG products, but most companies will have an equivalent product. Remember, do right, do it once. The above products require a little more care and attention to detail but the final results will be far superior to anything you can achieve with a spray can of cheap laquer primer.