what causes this?

[Worzel]

So i've been a bit busy, welding bits of steel in all the holes (well, not all, thousands left).
So i thought i'd put a bit of primer over it to stop the rust,
and this happened

What sort of primer do i use to stop this?

[rossie]

Looks like you had a sharp edge on your repair and you put the paint on to thick, what you will have to do is rub it right back and re prime it, then rub that back with out cutting through the edge. Just haze the first couple of coats. It mite also pay to make sure the paint you have and the one you are using are compatable. Good luck

[Worzel]

that bubbling is one of the old layers of paint,
i feathered it and it was smooth as,
It happened everywhere that old layer was exposed

Hey, what's wrong with this bedford?

[Numnutz]

enamel over acrylic maybe

[restoreid]

Other way around Numnuts the thiners react to the enamel Happens to me all the time

[Worzel]

is there a solution?
use enamal primer?

[Numnutz]

I am pretty sure there are sealing primers made just for that problem. but it may not be the best solution.

Maybe using an acrylic paint would be better???

[restoreid]

Go ask at a auto paint suppliar You just cant paint acrilic over enamil the thiners just melts the enamil but im sure there is a undercoat you can get to spray over first then go your 2pack or acrilic over that or just spray the van with enamil like I did there are some good quality enamils out there now I just used ordanary house paint looks ok Cheers Reid

[rossie]

that stuff is called Isolater, a few layers off a dry haze spray over the repair can give you the same result, what l mean is to put the paint on thin like a guide coat for the first couple of layers but  what ever you do don't spray a wet coat cause it will flair up worse. A good hi fill will help seal it down and another thing to take in is don't let the panel be cold

[Worzel]

and another thing to take in is don't let the panel be cold

hahahahahahahaha, warburton in the winter, there's snow on the mountain already.