Primer

[hum3]

Hi all

What primer should be used on a panel that has partial break through and the metal is exposed? for example a panel that is showing 20% metal 80% original paint.

Etch should be used on metal but would this react with the existing paint?

 

[Chipper]

Have had that happen with etch but not with epoxy, it doesn't seem fussed by what's under it.

 

[steveo3002]

it shouldnt react on sound paint , just dust it on no need for a heavy coat

 

[norsa]

As Steve says just go light on couple of coats and if it pickles a little, just dry it out with local heat and flat back a little. subsequent coat will be fine.

 

[hum3]

Brill

Next question

New Panels, they come in some black electro type of primer, is this sufficient primer ready for paint or do do they need an etch primer ?

Sorry for all the questions.... you're fault for being so helpful

 

[vdubz]

I think the quality of paint used by manufacturers varies quite a bit, so its impossible to tell if good or bad primer has been used. If you want the job to last, then i would say strip and re prime with epoxy, if not then just sand and paint.

 

[steveo3002]

original factory black electro primer is fine to key and high build etc

if theyre pattern parts try some thinners on it and see if it touches the black , cheapo parts will just be sprayed on rubbish which id advise gets a good sanding back

 

[langy]

Brill

Next question

New Panels, they come in some black electro type of primer, is this sufficient primer ready for paint or do do they need an etch primer ?

Sorry for all the questions.... you're fault for being so helpful

Etch primer is a bit old hat nowadays, if you want it to last use epoxy primer, I usually sand off the electro stuff, it's not brilliant

 

[norsa]

normally the black stuff is a cataphoretic primer which is designed to keep the rust away during storage not for overpainting. Rule of thumb, if you can wash it off with celly, do so then scuff it up with 400.
Nick