Rusty Primer and Behr Paint over existing paint.. to use or not to use?

Guys,

In the dissasembly stage of my rig and prepping for a Cummins 5.9L and Ford F350 Dana 60KP/Sterling 10.25 axle swap on my 67' Kaiser M-715. The jeep has yellow DNR paint over the original Olive drab. The DNR paint has survived 30+ years. And I'll never be able to remove all of it. Curious what everyones thoguhts are on scuffing 120 grit and 220 grit on the yellow, then overspraying rustoleum rusty metal primer atop the yellow... and then spraying Behr Ultra Premium House Exterior in 24052 color. (USMC Forest Green).


Is this the way I should approach or do you think throwing the Behr right atop the existing scuffed up paint would be OK. (The truck has VERY little (IE almost zero) rust.... only rust is surface on the bed floor. (which will be rhino lined eventually anyways.

Thoughts?

Rustoleum Rusty Primer atop the DNR yellow... then Behr... OR

Behr atop the DNR yellow... without primer.

Thoughts?

i would say primer the rust spots sand and paint over the rest.

Instead of starting a new thread, I'll piggy back on here. I was all set to go with Rusty Metal on some hmmwv's I'm prepping where I had to go down to the metal. However, I'm being warned by some that Latex will not last long on top of an oil based primer. I'm interested to hear more thoughts on this and anybody out there who has done this more than a year or two ago, how's the paint holding up?

THe behr I got yesterday, they indicated it has primer mixed in. I'm not planning on putting primer on any areas that have the Carc underneath. Would appreciate input.

THanks.

I would like to know this as well. I have been sandblasting my M37 parts and to keep them from flash rusting spraying them soon after with Rusty Metal primer. I read though the data sheet and I don't see anywhere about not painting over other paints. Just should not be oily or loose paint.

http://www.behr.com/binaries/conten...pdfs/pro-technical-data-sheets/5850_r1115.pdf

Never apply oil based paint over latex, it's latex over oil. I'm not sure who you talked with about that but people have been putting latex over oil for a long time since the VOC rating has became more strict.

kfrosty said:

Instead of starting a new thread, I'll piggy back on here. I was all set to go with Rusty Metal on some hmmwv's I'm prepping where I had to go down to the metal. However, I'm being warned by some that Latex will not last long on top of an oil based primer. I'm interested to hear more thoughts on this and anybody out there who has done this more than a year or two ago, how's the paint holding up?

THe behr I got yesterday, they indicated it has primer mixed in. I'm not planning on putting primer on any areas that have the Carc underneath. Would appreciate input.

THanks.

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I painted my truck in May 2012. Behr over Rustoelum. Latex over oil based primer. 4 years later it looks fantastic still. I should add that the front wheel came off another truck last year and hasn't been painted. Also the bumper got chipped from hitting trees and I sanded it down to bare metal but never got around to repainting. There are SOME spots on the bed and fenders where rust did come back through but I'll hit those with POR15 when I touch this up in the summer.

May 2012



April 2016



There are whole threads dedicated to behr paint where people have used rustoleum underneath. You can listen to those who assume or those who have done it. Your call.

Mikey

We did the Behr Exterior Latex (383 equiv color) over both blasted clean metal (bed, crane, frame, rims) on the HMTT (HEMTT Prototype) with the Rustoleum Primer, and then the same Behr over the CARC Paint on the aluminum Kenworth cab (no need to take it down, nor did I want to get into priming aluminum) on the HMTT - been over 3 years and looks great.

Howdy,

Just a quick note about the Behr paint with primer mixed in...

I painted a house with the Behr/primer paint and it Did Not Turn Out Well (Northern NV with lots of hot sun in the summer)!

When I took samples to Home Depot the paint manager told me I was a Big Dummy for not using a separate primer and all of my spotting and lifting paint problems were because of my not using a separate primer. His comment was "I don't give a **** what some brochure says...."

Just say'n so YMMV...

Happy Tails,
tom n tyler

I hit the rust with a wire brush and then use Tractor Supply red oxide primer on the rusty areas. I paint over the primer with Behr. No problems with adhesion.

When painting latex over oil based primer how long do you let the primer dry before painting? Have heard that it's best to wait up to 2 weeks to allow primer to off-gas, but not sure how true it is.

I think the rusty primer says wait 48 hours to put the final coating.

I waited a couple of days before painting over the red oxide primer.

Is there a color palette for military paints? All branches?

We could sure use the front axle, or just the drive shafts of you 715 if your changing them...?

jcee said:

Is there a color palette for military paints? All branches?

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Yes, google the subject....many images.

Here is my brush and roller job. Holds up well and really easy to touch up. I did black enamel in the bed to keep it sliding

Used Rustoleum rusty metal primer on mine. Prepped rusty areas with high speed wire wheel on an angle grinder. On the areas with good CARC i used a palm DA sander. Going on one year and no adhesion issues. I'm sure there are reasons not to go this route but so far I'm pretty happy. I let the primer dry one week btw.

Smokinyoda said:

When painting latex over oil based primer how long do you let the primer dry before painting? Have heard that it's best to wait up to 2 weeks to allow primer to off-gas, but not sure how true it is.

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YES. If the primer is an enamel, it is best to wait approximately 3 weeks for it to fully "gas out" and cure properly. Afterwards, lightly scuff it and apply the Behr for best results.

Several companies make a rust reformer. I think it chemically reacts with rust and somewhat neutralizes it, or maybe just slows it down. I used it on my flatbed and it worked. With only primer over it, 5 years later of snow and no rust signs.