primer drying

[ugabulldog]

A friend sandblasted then primed my wheels with a spray gun, he went back over them with primer not long after, it was barely dry to touch. The next day I put out in sun to help dry, and when I went put back under shed (24 hrs after painting) I rolled across ground (heavy rear wheels) and the primer came off. Did he do not wait long enough between applying or do they need to just dry more? thanks

 

[Army grunt]

He may not have wiped the dust off, or cleaned with a tack rag.One more he may not have stirred the paint, theirs drying agents in primer. imo
Army Grunt

 

[ugabulldog]

He may not have wiped the dust off, or cleaned with a tack rag.One more he may not have stirred the paint, theirs drying agents in primer. imo
Army Grunt

he blew off with air compressor, pretty sure he stirred enough but could be wrong... thanks

should it be ok if I just let it dry longer before handling or spraying with paint? (I will put it out in sun again today, wednesday, to help dry, was painted moday afternoon,... boy those 28" are heavy without rolling!!!)

 

[Soundguy]

might not have cleaned the rim with a dewaxing solvent. when i see primer sheet off, it's usually a bonding problem, or the solvent in the primer made something else lift.

soundguy

 

[hizoot]

All primer that I've used or seen used,dries very quickly. Make sure he wiped the wheels down with a dewax solvent . ...and used the right solvent for the primer. Sounds like a compatability issue somewhere along the line. I wouldnt spray paint until you have it figured out

 

[Soundguy]

rim may be impregnated with a contaminant too.

soundguy

 

[nuffer460]

If the rims were blasted to bare metal. Like said before, there maybe something in the metal. That primer may have to come off. If there is any possible doubts about primer adhesion. Remove the new primer. Wipe down the rims with a good Wax / grease remover. Then use a metal etching primer. You should not have any problems after that. Metal etching primer is a little high, but I have never had a failure when using it. Epoxy Primer is also a great base, to start off a new paint job.

 

[pat32rf]

Anytime I've done metal spray priming the primer has dried in minutes. That was with "thinners" based primer. Epoxy base could take longer to cure, but it would be a matter of an hour, not days.
If he used epoxy primer then he may have a problem with his catalyst....in which case it will never dry properly

 

[TRR]

Since he sandblasted the metal, blowing the dust off with a blow gun is not good enough. There is still a dusty residue embedded in the metal. Use a cleaner and wipe the bare metal down. (And be sure the primer is applied properly.)

 

[ray66v]

Too many unknown variables to say for sure.

A properly sand blasted surface should be clean enough that you only need to blow it off, and prime it. That is assuming the air supply used to sand blast it was clean enough. If your air supply is not properly filtered to remove oil and other contaminates, then you would need to wash it with a solvent.

Yes, you should etch it before you prime it, unless the primer you use says it is unnecessary, most primers will need the etch for best adhesion.

If it is an air dry primer it should have dried by now, unless he really put it on way too thick. Which would be tough to do, but I have seen it done.

If it is a 2 part primer, it should have hardened after a number of hours at 70 degrees F or greater, regardless of the thickness.

It is possible the product is defective. Or, the wrong type or amount of hardener or solvent was used. Using either too much, or not enough hardener can easily result in improper drying.

If it is not dry soon, I would get a couple spray cans of paint stripper, that should easily remove it. Then, start over.

 

[4shorts]

I've done plenty of painting/priming and fabricating just check my links below my signature.

The guy who sandblasted and primed your parts did a great job if the primer only came off where you rolled the rims. He did nothing wrong. You already know what happened, you said the cause yourself. The problem is you rolled the heavy wheel across the ground removing the primer.

Primer is not that durable. Its applied to help the paint adhere to the metal. Depending on the weight of the wheel even if you powdercoated the rim it would have come off.

Primer and paint is not applied for wear. It's applied to protect the metal from corrosion and give it a nice appearance. No matter what you apply on the rim IF you roll it across the ground it will come off. Prime and paint it again and find a way to move it with out removing the primer again.

 

[Soundguy]

i usually like epoxy primer on rims. pretty darn durable too.

soundguy