Bondopocalypse II

General Discussion. Make yourself at home...read, ask and answer!



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PostPosted: Sun Nov 27, 2022 4:13 pm
Just finishing up this Bondorific patch job on my rocker panel (and opposite side rear panel section) and need advice on how to finish things up. I believe I've read that bondo can be spread as thin as you want as long as it has good mechanical adhesion, but I'm wondering as I do these last steps if I might could use something else meant for filing in more nuanced scratches and little valleys.

Basically I've got both panels shaped about like I want (exposing some sheet metal along the way) and now I just need to fill in the 36 grit sanding marks on the bondo, cover the exposed aluminum, sand up to 800? grit, then go at it with color coats and then clear.

2 questions are...

- What should I use to fill in the bondo scratches and cover the exposed aluminum? body panels?...possibly some kind of high build primer?

- What's the minimum grit you need to sand (the primer?) up to before applying the color and clear coats? I've been told anywhere between 400-800. For the bonding between the color and clear coats I'll be timing them to take advantage of chemical adhesion.

note: Since this picture was taken I've added another skim coat of bondo to fill in those small bondo divots, but I should have those same 36 grit scratches after I sand it back down again.

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PostPosted: Sun Nov 27, 2022 7:34 pm
Go over it and fill the big holes then sand back level with P80. Then skim over the whole lot with a fine filler and sand with P180. You may need to thinly skim again to get any pinholes, then sand with P180 - P240. A good high filling primer should be able to fill these scratches and then sand with P600 - P800 before base coat.

Don't take my posting here as condoning this repair which is as bad as it gets and will likely fail.
Chris



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PostPosted: Sun Nov 27, 2022 10:33 pm
And they wonder why Bondo got a Bad rap

:shocked:

No I will not give advice, as he ignores good sound advice and does it his own way any way so why bother? He knows more than all of us obviously.
Dennis B.
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Line Maintenance A&P Mechanic and MOC Tech specialist.

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PostPosted: Sun Nov 27, 2022 11:03 pm
Yep, based on where all that filler is.... well, it's going get wet, swell, and peel right back out of there..... just a matter of time......
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PostPosted: Mon Nov 28, 2022 5:34 am
DarrelK wrote:Yep, based on where all that filler is.... well, it's going get wet, swell, and peel right back out of there..... just a matter of time......


if it doesnt start cracking and falling out first.

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