help with sanding please
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Junior User
Joined: Oct 2003
Posts: 61
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From: Colorado Frontrange
help with sanding please
hey all-I'm in the process of prepping my Harley for paint-needed to do a skim coat of Bondo on the fenders because the aftermarket fenders are a little wavy-My problem is keeping the contours consistent when sanding the bondo-Ive tried flexible sanding blocks-sanding at different angles etc-I'm getting really frustrated-flat areas arent a problem-the compound curves are driving me nuts-I seem to either sand too much or not enough-I'm about to the point of having somebody in a body shop do the last skim coat for me-anybody got any suggestions??????? 
Admom
Joined: Feb 2001
Posts: 9,414
Likes: 201
From: Silver Springs
Lots of patience, a good eye and pick up a curved sanding block. A friend in the bodywork business gave me one to use on the '41s cab and it works great. I picked up a smaller one at one of the swap meets for tighter areas.
Before I got the sanding blocks I did the fenders by hand and they turned out real good. The fenders are all rounded with a hairline peak on the top so it took me a few weeks to get them right.
Patience is really the trick. Don't try to sand off too much at one time.
Before I got the sanding blocks I did the fenders by hand and they turned out real good. The fenders are all rounded with a hairline peak on the top so it took me a few weeks to get them right.
Patience is really the trick. Don't try to sand off too much at one time.
Posting Guru
Joined: May 2002
Posts: 1,495
Likes: 2
From: Northwest Fl
When you think your getting close to smooth, dust the area with a very light fogging of aerosol spray paint, then begin your sanding again. This 'guide coat' will show the high (and low) spots quickly, as the paint is removed. Continue sanding the high spots until your base primer (epoxy or etch?) begins to show, and then re-apply more 2k or more filler if necessary, on the low spots. Re-fog and repeat, until your smooth.
Carlene is right, patience is the key, walking away and returning later seems to help.
Carlene is right, patience is the key, walking away and returning later seems to help.
Thread Starter
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Junior User
Joined: Oct 2003
Posts: 61
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From: Colorado Frontrange
Thanks for the input-I guess persistence is key-what the plan is-parts were sand blasted then primed with PPG DPLF40-do the fill work and a final glaze with evercoat glazing putty-re prime with the DPLF40-hit it with K36 primer surfacer and block sand-seal with the DPLF40 (reduced) and then start the color coats with DBC-this is my first adventure in this so if ANYBODY has input I'm all ears 
