Pre prepping frame for paint issues

Ok so I had the f100 frame sand blasted then I pre prepped it. I had used industrial rustoleum primer and thinned it out, layed a few coats down and let it cure/dry a few days. Now I am using scotch brite to scuff it up so I can spray the actual paint and the primer had came off a bit and is darker underneath. I can peel it up with a finger nail. What happened?

 

Did you metal prep the frame before priming? HRP

 

Yes I did

 

Did you use the proper thinner? Maybe it shouldn't have been thinned at all and brushed on!

 

Did you use the metal prep according to the directions?

 

What kind of prep did you use?,,was the Rustoleum primer a oil base type?HRP

 

What I used:

 

The can says DTM which means "direct to metal" Do not use primer.
You may have to remove it and start over.

 

I'd do a test patch with no thinner.

 

I've never heard of the prep or thinner,,I only use stuff for the automotive body shop,,,Just a thought,,has the paint thoroughly set up?,,has the weather been real humid or damp? HRP

 

Hard to believe anyone goes to this extent unless you are building a show vehicle...
I've had good luck with Rustoleum red oxide primer, let it dry for a week, cover with Rustoleum black....

 

I do it the way I was taught,,whether its a high dollar build for someone else or something I plan on keeping. HRP

 

Exactly! You are right! I hate half ass work

 

What is it you suggest I do since the primer has already been applied?

 

Almost looks like the primer went on to dry.

 

It looks that way because I ha e scuffed it with scotch brite

 

maybe the primer needs more time to dry?

 

I have tried to find some information on the klean strip prep all and all I can find is wax and grease remover,,did you use this on the frame prier to applying the primer? HRP

 

That is not a metal prep, it is merely a wax and grease remover. ( I was typing when you posted^)


Also, the primer you used has no hardener? If not it never cures, it just dries. I am not surprised you are seeing it do that. The product you are using is an industrial product for a completely different purpose that to which you are using it for.

 

Looks like the 1st coat of primer dried before the second coat went on.
With your fingernail, are you removing all coats of primer back to bare metal? Or are you just able to pick off the top layer? Kind of like the second coat isn't stuck to first maybe?

 

I had used that spray beforeninshot the primer. That can of paint isnt the primer its just the same brand I used.

 

Yes I had used this before I shot the primer

 

Im npt taking it pff im just able to pull it pff with my fingernail

 

If it's easy to peel off there is some type of contamination between the metal and the primer. HRP

 

Did you get all the wax and grease remover off before priming? I have seen some of them leave a film on the panel, thereby causing a bonding issue. The primer never really gets on the metal??

 

This doesn't answer my question - not even a little

 

You're saying the primer you used was alkyd enamel, right ?
Alkyd enamel is a slow drying paint and stays somewhat soft.
Way back when I started painting you had two choices,
nitrocelulose lacquer or alkyd enamel.
with todays paints, the catalysed acrylics & urethanes dry quicker & harder
than alkyd enamel.
Be sure your top coat color material is compatable with the base primer you use.

 

what type of thinner does it say to use on the rustoleum can?

 

Yes the first coat dried before the second. Thats what is supposed to happen. Right?
No im not removing all coats with my nail im just saying that area is that easy to peel.

 

If it's just that area, go back and sand it out, clean it up and reshoot the primer then the paint and blend it in as best you can. With Rustoleum stuff though, you have to let it dry for quite a bit before you shoot a topcoat over it. I like to give it about a week before topcoating, then let that dry about the same.