7 replies to this topic

[Old Bob]

I know it's great stuff on bare metal but reacts with almost anything else which is already there - even really old stuff. However; can anyone comment on overpainting Hammerite with cellulose?

You could save me making extra work for myself!

Bob

[Mini_Alex]

If you use some sort of Barcoat (barrier) primer you should be able to. Its not recommended to paint over Hammerite but it may be worth a try.

[cal844]

use barcoat first... or take it back to bare metal then prime and repaint

[Old Bob]

Thanks Guys.

Bob

[Sam]

Tried spraying U-pol Gravitex over hammerite. Not sure if Gravitex is celly, but it reacted awfully and massively delayed my project.

I'd avoid hammerite on any parts of bodywork / floors - apart from the reactions, it's not great on cars as it is brittle and cracks when the panels flex

[skoughi]

I was advised its ok to use as long as its left long enough for the oils, thinners etc to evaporate. I'm talking about at least a month, but this could change with different temps and humidity. I've use hammerite on the inside of my boot which will end up getting panelled so not so much of a problem in my eyes. I've also just primed the inside and underside will an oil based primer as it'll be a good while before I stonechip it so I'm hoping things work out! If there's still a reaction then a barrier coat will have to be applied.

[jaydee]

Hammerite will be a bit time consuming to sand it back, i've painted over hammerite using a barcoat primer, no problem at all

[skoughi]

Yeah its tough stuff! I had to sand back some as a little rust had started again and it needed it all to get it feathed out. I sprayed on some etch primer and what landed on the hammerite didn't react. But the hammerite had been on for a good while.