Soap Box Derby - Body filler question -
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post #1 of 3 Old 04-09-2013, 06:26 PM Thread Starter
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1986 CJ7 
Join Date: Sep 2008
Location: New York, NY
Posts: 97
Soap Box Derby - Body filler question

This isn't a Jeep question, but it does deal with body filler so I'm hoping I'm in the right section...

My son and I are building a soap box derby car and the body is going to be masonite hardboard (brown colored 1/4", slick on one side, rougher on the other). We're looking for that smooth look so I want to put body filler over the screw holes so that it ends up being smooth and then we'll paint it.

My questions are: with body filler hold to the slick side of the masonite hardboard? Will I need to scuff it? Will the body filler eventually crack on me with all the bumps (small wheels) and the fact that the body will probably not be 100% solid (the frame will be all wood/2x4's, so I'm guessing it'll have some play, I'm hoping for none). Any tips on body filler for this application would be great.

CJ7 86, 258, BDS 4", 33's, currently in a frame off resto.

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post #2 of 3 Old 04-09-2013, 08:56 PM
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1986 CJ7 
Join Date: Feb 2013
Location: Iuka
Posts: 72
U might have already got ur mat. But if u have not i would go with 1/2 or 3/4 BC plywood . Then get a kreg kit and use pocket screws and wood glue. It's easy to use and makes a super strong joint and screw holes will be on the inside.
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post #3 of 3 Old 04-10-2013, 07:16 AM
Web Wheeler
1974 CJ5 
Join Date: Jan 2005
Location: Santa Maria
Posts: 1,641
Bondo does work on wood with the smooth surface of masonite you'd probably need to scuff it up for it to hold best. Personally I would go with plywood like BDP72 suggested. If you take your time with sanding you can get it incredibly smooth.
thantos858 is offline  

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