Priming the frame
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Postmaster
Joined: Jul 2008
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Priming the frame
I asked this question on another thread but needing a quick turnaround so I'll post here in hopes of getting the info I need to move ahead. I got my frame back from the sandblaster a few days ago and have stripped everything off including suspension and axles. It's just the frame. I plan to prime it with Rusty Metal Primer from Rustoleum and bought a small HVLP gun from HF. I plan to sweep out the garage real well and put a tarp down to protect the garage floor from overspray. I'll put some plastic around the perimeter to try and protect the rest of the garage as well. I bought some Jasco Prep & Primer to etch the metal. Is this a necessary step since I had it blasted? If I need to etch it how should I apply it and more importantly do I need to remove it once applied? The directions say rinse but it seems out of place to squirt this thing with water after I just had it blasted and have tried so hard to keep the rust from reappearing. Does it need to stay on for a certain period of time? Can I etch in the morning and prime in the afternoon. I'm hoping to knock this out tomorrow morning. Walk me thru this process...I would certainly appreciate it.
Elder User
Joined: Nov 2003
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From: green bay, WI
I by no means am a rustoleum expert, as I don't use the stuff, but if you had it blasted, then I wouldn't see why you would need to use the etch product at all, as the blasting should provide plenty of tooth for the primer to adhere to.
The reason you would have to rince with water if using the etching product I believe would be to neautralize it. Etching products normally use and acid to etch the metal.
I would just prime the frame if its been blasted and skip the etch. many etching products are not recommended on blasted steel, because the blasting will give the tooth needed, and the difficulty of neutralizing with acid collecting in the pores of the metal. You will want to get primer on sandblasted metal asap, like as soon as it done being blasted, as it will start rusting quickly, and it sounds like its already been sitting a few days. Blasting big trailers at work and on a humid day, areas you already blasted often start rusting on you before you can even finish blasting all that area.
Not using rustoleum, I have no idea the level of protection it will provide to steel, and how well it prevents air and moisture from getting through. I like using an epoxy primer.
The reason you would have to rince with water if using the etching product I believe would be to neautralize it. Etching products normally use and acid to etch the metal.
I would just prime the frame if its been blasted and skip the etch. many etching products are not recommended on blasted steel, because the blasting will give the tooth needed, and the difficulty of neutralizing with acid collecting in the pores of the metal. You will want to get primer on sandblasted metal asap, like as soon as it done being blasted, as it will start rusting quickly, and it sounds like its already been sitting a few days. Blasting big trailers at work and on a humid day, areas you already blasted often start rusting on you before you can even finish blasting all that area.
Not using rustoleum, I have no idea the level of protection it will provide to steel, and how well it prevents air and moisture from getting through. I like using an epoxy primer.
Senior User
Joined: Sep 2007
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I agree with Kenseth, i would skip the etching part. What i would recommend is geting some acetone and cleaning the surface thoroughly, it will remove any grease, dust or moisture and evap quickly. Then get to painting. Since you mentioned you bought a spray gun for this i'm going to assume this is your first time painting. It's easy if you're patient, but be sure you are prepared for clean up... It was the biggest pain in the butt for me, i was not prepared. Get the solvents ready to go, have a station cleared and setup for tearing down your gun and have a proper means to dispose of the contaminated solvent... You'll need to break the gun down right away, and get to scrubbing. Another trick i use is to pore a tiny bit of solvent in the cup first and spray it though the gun to get rid of any moisture or contaminates... Just some ideas for ya... Good luck and post some pictures...
I'll be done with my frame nest week so we can compare experiences.
I'll be done with my frame nest week so we can compare experiences.
