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Help with Bondo

P

petertew

Gawd
Joined
Oct 4, 2005
Messages
984
I'm working on my HTPC case, and I'm having trouble with the bondo part of it. I am trying to build up about a 3/8th inch layer of bondo around the PS1 LCD screen I have installed and then sand it down at about a 45 degree angle.
The problem I'm running into is that even though I have the whole thing sanded down and it looks and feels smooth as can be, as soon as I prime it all these little imperfections show up. I've been sanding it down with 80 grit, then 200, and finally with 400 grit. Then I prime it gray and finally I will spray it a flat black.
Can anyone give me some tips on getting the best results with bondo? This is the first time I've ever used it. Thanks.
 
i usually build up the first layer of bondo, then sand as you have mentioned. I then use a small waft of black paint to show up any imperfections. Then using a small amount of bondo at a time I use a wet finger to rub it into the holes. Once done I then use 600 grit wet n dry to finish it off. It sometimes takes a few runs to get a perfect finish.
 
I've been doing something similar to what you proposed. I laid down about 4 layers, sanding between each application. I then filled in all the minor holes, although I used a dry finger, and sanded those down. I guess I'll just have to try it with a wet finger and some black paint. ;)
 
I've never had to use the paint method to check whether or not it's a flat coat...

But yes, wet fingers really help.
 
Go to an auto body supply store (where body shops buy their supplies). They sell a paste filler in a tube that you use to fill the pinholes and such. You skim it on and after it hardens you sand it smooth. It goes on over primer or bare Bondo. Tell the counter person what you are trying to do and they will get you the right stuff.
 
Spot putty is your friend. It goes on 100x smoother than bondo. It's made to be a sort of "finishing" layer above the bondo. Doesn't cost that much and is well worth it.
 
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