Sanding?? [Archive] - Chevelle Tech

: Sanding??


BPeterson
Mar 27th, 01, 7:07 PM
I'm currently working on sanding my 69 Camaro but I'm wondering about what kind of sander to use.. I just bought a palm sander but it makes a circular vibration motion. I was wondering if the is the correct one to use. Also, What type of primer should I be using??

Peter F.
Mar 27th, 01, 8:18 PM
I'm assuming you mean to sand it so it can be painted, as opposed to stripping it. If so, use a long board or in-line sander.

You want something that is quite large in surface area so you can sand things flat. Since most panels are curved, the long length gives you that surface to sand flat. The sanders body shops use are a little longer than a sheet of sandpaper, just to give you an idea. The palm sander is probably 1/4 sheet and just won't sand panels flat.

As for primer, if you are paint prepping, you should use a 2-part high build primer. Usually, the primer that matches the paint you are going to use is the best.

Peter

Jimmy P
Mar 28th, 01, 9:45 AM
Don't use an electric sander, please. If you must use a mechanical sander, an air powered DA sander is good for removing paint and feathering out edges. For 'Blocking out' a car, which means to smooth an overall area or panel, you can use a long board sander (available at auto body supply shops for ~ $20) or even a large paint stick (5 gallon stirer). With 220 paper to start. Use a light touch and make 12" strokes going at the area in a cross hatch pattern. One direction, then the opposite. This will remove material from the high spots and leave the low spots filled. If you use too much pressure, you'll remove material from the low spots and you don't want to do that. As far as primer goes, use a high build urethane primer/filler or primer surafcer. It comes with a hardener and you must have a compresser to spray it. Rattle cans and cheap laquer primer just dosn't have the solids to fill like you need. You would need three times the liquid volume of laquer to fill as well as 1 gallon of urethane. Don't waste your time. Body work is frustrating enough as it is!

------------------
Triple Black 69 SS 396

BPeterson
Mar 28th, 01, 9:47 PM
Ok, thank you for the information, oh, and i returned my palm sander... This might be a dumb question but, when I am sanding the car, is it ok to leave some of the paint on?? Like origanely the car was green and I have sanded through all the clearcoat and some spots through the base coat... just wondering.

Jimmy P
Mar 29th, 01, 5:49 AM
Yes, the original paint is fine as long as it's not enamel. Urethane, epoxy or laquer is a fine substrate as long as it's 'healthy'. (Not peeling, bubbling or lifting) If you still have some of the original paint showing along with your primer, you should seal it before painting.

------------------
Triple Black 69 SS 396

BPeterson
Mar 29th, 01, 3:01 PM
Ok. Thank you.