Bare metal epoxy primer for truck frame

[Hay Dude]

Getting ready to paint a sand blasted steel truck frame.
Need advice on what bare metal epoxy primer to use.

Frame was rusty and needs prep work. Any professional advice for preparation appreciated.

 

[Roadworthy]

Check with a local auto paint supplier or body shop. Some primers are made to bond even to rusty areas.

 

[IH3444]

HayDude, Have used this product with excellent results.

Products

www.loctiteproducts.com

https://www.lowes.com/pd/LOCTITE-Rust-Neutralizer-10-2-oz-Rust-Remover/4764091

 

[Hay Dude]

Im hearing products like POR-15 cover rust and make it worse, but that could be rumor. I am planning on having all the rust removed with sandblasting, but it wont be like new metal, either.

 

[3Ts]

If you're getting it sandblasted, will the sandblaster prime it? If not, you'll probably get it back with a flash coat of rust on it. That would be ideal for a Phosphoric Acid treatment (Oshpo). That will convert the rust (iron oxide) to iron phosphate which clings very tightly to iron and makes an excellent primer.

 

[Hay Dude]

The sandblaster offered to prime it and has a paint booth.

I would think right after sandblast, it should be blown off and wiped down?

 

[dodge man]

If it’s sandblasted clean I would have him prime it. It would be important to get any sand off it and no grease. It seems like sand gets in and nooks and crannies so it would take some time. Good primers often say something like “self etching”.

Keep in mind most primers won’t keep water out. It will stop tge surface rust for a short time but it should be painted pretty quickly.

 

[Carl_NH]

Had my mower deck sandblasted then coated with 2 part epoxy primer per the SB guy epoxy is best over SB metal. You don't need metal etching primer and epoxy is harder. The only caveat is most epoxy primers recommend painting within 48 hours of application, otherwise if longer than a few days, they suggest to sand the primer for adhesion.

 

[crashz]

The sandblaster offered to prime it and has a paint booth.

I would think right after sandblast, it should be blown off and wiped down?

Yep - Wouldn't hurt to have him paint it too. Then you don't have to move the truck, re-clean the frame and paint it.

I'm a fan of the Chassis Saver by Magnet Paint and Eastwood products. Eastwood will have a good etching primer, then follow up with a a good paint (like their chassis paint or Chassis Saver). Not cheap, but good stuff.

And even though it will make that nice new paint look like garbage, a top coat of Fluid Film Black or NH Oil Undercoating will keep the rust from coming back. You'll want to paint first, but you'll want a penetrating oil to get in between the frames.

 

[nyone]

Im hearing products like POR-15 cover rust and make it worse, but that could be rumor. I am planning on having all the rust removed with sandblasting, but it wont be like new metal, either.

If your not taking the frame off the body dont bother. There will be many places you cant sand blast and cant paint. All it takes is one rock and your paint is gone.
Woolwax or Fluid film work well, are self healing to some extent and you can spray areas you cant normaly get to.

Yes POR 15 sucks. The amount of prep work to get it to work properly is the same as normal paint..and your one rock chip away from failure.