Surface rust

[mriz]

If the weather will allow I'll paint next weekend. I do have surface rust due to the amount of time it took to strip to bare metal. Can I just sand then prep or will this rust return to haunt me?

[blitzkraig]

Get rid of all rust from the surface before you apply anything over the metal. It may take a while but the rust will break through eventually.

[26th-Z]

Yes, just sand the surface rust off. You may want to prep with a phosphoric acid solution used to prep surface bare metal like OSPHO. Home Depot sells it as a paint prep for metal. Spray it on, let it sit for a moment, and wipe it off.

[mriz]

Thanks guys, I hopefully wash and paint this weekend.

[beandip]

Are you planning on spraying epoxy primer first on the bare metal?

[mriz]

Just got back from vacation, Yes I am using omni system mp170 epoxy then mp 282 high build, sand then basecoat/clear. Weather has not cooperated as of yet and gun wound up on backorder. Hopfully gun shows up by thursday and I can get started. Thanks for responses.

[Ares240Z]

For the rust, try picking up Naval Jelly. It'll eat off the rust and give you a clean surface to work with. All you have to do after using Naval Jelly is give it a cleaning with a Wax and Grease remover, and some soap. Dry it off and shoot your primer. Worked great on my buddies 68 Stang. Good luck!

[beandip]

MRIZ , this is the same stuff I am using . Good luck.

[Carl Beck]

Hi Mriz:

Is the "surface rust" coming through some type of primer you coated the bare metal with long ago? Or did you leave the metal bare to begin with?

With bare metal you have two problems, "surface rust"... that you can easily see.. and "flash rust". Flash rust can not be so easily seen, it's in the microscopic pours of the bare metal. What you do with or about both types of rust, to an extent depends on how good a job you want to do - or need to do.

"IF" you sprayed a very light coat of primer on the bare metal right after you sanded it or stripped down to it... Or "IF" you left the metal bare... and "AS LONG as it's actually just surface rust....

I'd take a few course Scotch Brite pads, and scrub the area down with Ospho... the slight acid bath will remove any primer and surface rust - while the Ospho will prevent "flash rust" for several days.

Just splash on the Ospho and scrub everything down (kind of like wet sanding, instead of water you're using Ospho).

After you scrub it down to bare shinny metal, you need to let the Ospho work for at least 12 and better still 24 hours. That will convert any iron oxide (rust) into iron phosphate. Then just before you are ready to apply a good epoxy primer... you can wash the metal down with water (to get rid of any buildup from the Ospho), blow it dry (good and dry).. then spray on the primer.

Works for me:-) and in most cases it's the easiest thing to do..

regards,

Carl

Carl Beck

Clearwater, FL USA

http://ZHome.com