helloguys,
i got a question about bondo, i recently
got a nother prodject car and im gonna have
to use some bondo,probably a1/4"inch thick in a spot or two any body have any good how to's and donts ? i basicly want some good tips. i was considering cutting panels but its only gonna be a daily driver.thanks

1/4 inch thick is too much. Generally, no more than a 1/16th to 1/8th is recommended. You should try to bring the sheetmetal back to its original contours as much as possible before applying filler.

Randy is right 1/4 is too much. A good tip or a great tip is bring back as much metal to its orginal shape as possible. Never apply bondo over rust it wont last a week I promise you that. Make sure the surface is clean and free of grease before you grind any paint and apply filler. Dont slap it on all at once trying to fill it in one shot. Apply several layers, the first layer is more like bonding layer for the other layers, its just a skim coat. Apply the fisrt layer with heavy pressure which forces out air bubbles. The best advice is go and talk to a local shop most smaller shops will be happy to show you the ropes of mudding. Buy books that deal with restortions and body work, sometimes those pics they have are worth a thousands words and easier to understand.

------------------
1970 chevelle
1970 chevelle SS455 not a typo its a buick baby
1949 and 1972 chevy trucks
http://briefcase.yahoo.com/bc/sevt_chevelles

Search the Team Chevelle archives for a post called "Bondo Basics", by MARTINSR.
VERY informative -- the man knows his stuff.

Cheers,
mark.
'71 Fodor

You should pull the dent as much as you can first. If you need to drill holes to use an impact puller, be sure to weld them back up.
Don't use bondo to "fill" a dent like this. Use something better, like duraglass. It has glass fibers imbedded into it and that helps add strength and helps stop cracking. It is harder to sand, but will make a better fix.
Use the bondo to bring the ding to the right surface height. Use All-Metal to finish it off.
Course, if you really don't GAD, just slap the mud in there.

Dave