bondo soaking up paint?

[thepowderblue]

So I took off the emblums on my trunk and welded in the holes. while I was at it and I had the bondo out I filled in some dents. primed and painted and its like the bondo is soaking up the paint.

[thepowderblue]

thats just dust from sanding everywhere

Dent no more


Emblums no more

[Jarrett]

Did you wait long enough after you applied Bondo before you primed? Did you spray enough primer down?

[thepowderblue]

Did you wait long enough after you applied Bondo before you primed? Did you spray enough primer down?

idk ive never used it before.
I put the bondo on, waited just under an hr then I sanded it. Then I primed it with a few coats of primer, waited another hr then I painted.


You can see what I am talking about in the 2nd pic where the H went.

[mr_sp33]

When bondo sets, it sinks. Usually you would leave it for much longer than an hour before sanding it to find low spots, leveling it out and then applying paint (or more bondo).

There should be directions on the back of the tub though, every brand is different.

[cuate01221]

When bondo sets, it sinks. Usually you would leave it for much longer than an hour before sanding it to find low spots, leveling it out and then applying paint (or more bondo).

There should be directions on the back of the tub though, every brand is different.

This is entirely wrong. I work with bondo almost everyday of my life. To use it properly you must grind off any paint and only apply the bondo to bare metal. Wait until the bondo is dry(10 minutes) and start sanding it. Usually you need more than one coat to get it perfect. After that you use etching primer on any bare metal spots. Then use "building" primer. After that primer is dry, you would put some guide coat on, sand with some 320 grit until mostly flat(trying not to break through so much), then wet sand with 600 grit. After than, clean with wax and grease remover and use surfacer primer. Then you would use paint and clearcoat. Then Just wet sand and buff.

This is how I have done any job that I get and I have never had any problems with the bondo.

[TimmyPone]

did you use a sealer before your base
because even with some primers you need to use a sealer before your base

[thepowderblue]

did you use a sealer before your base
because even with some primers you need to use a sealer before your base

what, Idk wtf I did. after it was primed with the cheapest primer I could find I painted it with a single stage paint.

[wherm]

did you prime it with spraybomb, or use a 2 part primer? You need a catalized primer over your filler, otherwise it doesn't "truly" cure and any topcoats you apply will just soften that cheap primer and it'll look like crap.

[thepowderblue]

"spraybomb"