for what it is worth, here is my recent (today, in fact) experience.

1955 with multiple coats of paint (in a bad way...)

used a dewalt sander with 80 grit on the 'decent' paint areas.

used this:

http://www.lowes.com/pd_117946-70-D26453K___?productId=1005793&pl=1&Ntt=dewalt+sander

(similar to that)

with this

http://www.lowes.com/pd_361311-1069-12051___?productId=3456212&pl=1&Ntt=sanding+discs


had some spots so bad that I went with a dewalt grinder and the harbor freight 4.5 inch poly grinding pad (buy several) previously mentioned. I had to go buy more today. they do wear out.

http://www.harborfreight.com/4-12-in-polycarbide-abrasive-wheel-60571.html

used this (but take off the guard):

http://www.lowes.com/pd_674788-70-DWE402W5_1z0wcir__?productId=50373864&pl=1

I agree with other posters that you do not have to go to the metal 'all around' if the paint already there is solid and can be sanded to make a uniform base for paint or primer.

in my case most of the body panels were ok. but, the hood is so bad that I have gone through 2 poly grinding pads and am only through 1/3 of the hood. it was so bad that the paint had split and cracked in a way that I have never seen before.

lastly, take your time - it is not a race. go over everything and then make a second pass, and then a third pass if necessary.

have fun!

Last edited by hplacesbf; 09/02/2015 10:04 PM.