Dulux have been making this for few years.
If it had been the cold, the primer will have small crystal in it, i would say it either was a contaminant or it was not stir for long enough as it oil based, and you can only use oil base products as a top coat.

As others have said, use a chassis paint designed for this job or power coating, hammerite is ok, but doles quite quickly.
Terry

I used that chassis paint from frosts. I'm assuming its the stuff they make them anti-tank rounds out of cos its freaking nails. They ain't kidding either with the warnings on the tin. Don't let the paint touch the lip of the tin or when you put the lid back on it seals the lid onto the tin forever!


Por 15 by Frosts Restorers

looks like surface contamination to me. use panel wipe rather than acetone, they tend to throw other crap in with cheep acetone where as panel wipe from a proper paint supplier is made for the job

i spent nearly a day sanding my chassis with 300grit paper before i painted it, sprayed it with epoxy mastic 121. in the year its been on the road i have been out in the rain slat grit etc etc so far no rust just a dirty car :D

the key is in the key. nice scratched metal surface helps the paint stick.

Thanks for all the replys...Ash G i spoke to the painter in work today and yes it is contamination i need to wash it down with sugar soap ...he also told me if i had spat on it it would have not come through !!! but think he may have been at the meths last night !! I dont have any spraying guns for my compressor and funds for the next few weeks running short due to TAX MOT on Family car so a brush on topcoat would be in order ...how much of that hard tank type paint would the chassis need ?

Just been out and fixed this...i thought a few mm would sort it but after using a measuring stick and a matchbox trick a pipefitter at work taught me 15mm got ripped off the right leg !!!....now its spot on and fully welded....now for the cross bar and downstays...

Nice one Andy , sounds like you are really cracking with your build :cool:

cheers
andy