Protective coating over bondo?

[70bus]

I have been removing a crappy overspray from OG paint; naturally, some areas have filler on them. The bondo is firmly attached and sound. What should I put on these area to stop absorption of water or other damage? I assume primer is just as water permeable as bondo. Actual grey spray paint is fine as an option, as this bus will wear its scars - I just don’t want things to get worse.

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Craig K
70 Neunsitzer
65 Pritschenwagen
"If Von Dutch was alive, he'd walk in there with a pistol and shoot these people."
-Robert Williams

[74 Thing]

Epoxy primer

[70bus]

Thanks! Any epoxy primer (Rustoleum et al), or a 2-part? I'm fine with either, but box-store paint is easier to get/deal with. Obviously better quality...
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Craig K
70 Neunsitzer
65 Pritschenwagen
"If Von Dutch was alive, he'd walk in there with a pistol and shoot these people."
-Robert Williams

[Matt Wilson]

Epoxy may not be UV stabilized like other paints (it is intended to be painted over anyway).

If you are wearing the scars, just primer and paint those areas, even if it's with RustOleum.
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1972 Standard Beetle
1969 Baja Beetle

[70bus]

Thanks. I may wait for warmer weather and hit it with rattle cans of 2-stage primer and paint. The truck is garaged and the doors are in the house, so the bondo should stay dry before it gets painted. I can't do the 2-stage in the house or in a garage w/ closed door; might see if the final 2-stage coat is compatibile w/ a can of Rustoleum Hi-build epoxy primer I have and start with that.
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Craig K
70 Neunsitzer
65 Pritschenwagen
"If Von Dutch was alive, he'd walk in there with a pistol and shoot these people."
-Robert Williams

[74 Thing]

https://www.amazon.com/dp/B08WQ19YGT/ref=twister_B08WR8TF52?_encoding=UTF8&th=1

https://www.amazon.com/Spray-Epoxy-Primer-Paint-Ae...mp;sr=8-25

Wear a mask!

[VintageVulture]

wolfsburg west split bus spray can, primer dark gray is a quick and easy way to go
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The best things in life aren't Things
(they're Buses)