POR 15 and RUST on truck frame??

**Dirtcrasher** · 09-12-2010, 09:47 PM

I have a 1994 Toy truck, perfect motor and tranny, I won't be driving it, I took it off the road as I've been layed off for so long.......

The diff is so rusty I can smack it with a

and rust pieces fall off, so I'll do that, then I figured just a quick wire brush.

Other parts have surface rust, not nearly as bad and I figue I'll just wire brush them and por 15 them up. Some of them have perfect old paint next to them.

From what I've heard, Por 15 loves a rough rusty surface, nothing painted/smooth.

Should I just hit the bad areas and skip all the good ones so it won't peel at all or please share your experiences......

I figure I'll get like pint size cans as I hear once you open it, you had better use it!

THANK YOU!!

**fabiodriven** · 09-12-2010, 09:52 PM

When I did my F-350 I just banged off all of the heavy scale with a

and went to town. On the few areas that did still have paint the POR 15 did not stick too well so you might have the right idea just skipping those.

**harryredtrike** · 09-12-2010, 09:55 PM

yea dc,knock the loose stuff off and leave the rest and coat.i have a buddy that puts that stuff on everything.he swears by it.just dont get it on your skin.if you do youll have to wear it off

**Thorpe** · 09-13-2010, 12:07 AM

On the big scaly stuff, I usually buzz it down with a grinder, just to smooth out the highs, but not take it to bare metal... Just did a 38 buick frame on friday with it! And Harry is correct... I have 2 drops on my forearm I am wearing off currently...

**300rman** · 09-13-2010, 08:39 PM

Yep. knock the scale off and go to town. careful, you WILL get it all over you......wear junk clothes......

doesnt come off. if it dries on your skin, its THERE to wear off. wipe it off with thinner ASAP.

the crap sticks to rough rusty frames better than Powdercoat sticks to items......but avoid clean/smooth surfaces. it sticks to the rust and stops it. there is nothing better for said application.

**SYKO** · 09-13-2010, 10:33 PM

there is more then just painting por15 on there is other products you have to treat the metal before hand, its also expensive look up all the processes before you dive into that.

**300rman** · 09-13-2010, 11:55 PM

Sorry SYKO, but i have to disagree. ive had a multitude of trucks come through our shop that i have POR'd the frames on. all i did was knock the scale off and apply the POR. years later, the POR is holding strong, and looks nearly as good as the day i completed it. mind you, these are trucks that plow snow and spread salt in the winter. as long as the areas you are applying the POR to arent greasy or oily, then nothing other than knocking the scale off/removing loose crap needs to be done in preparation for POR.

**Kilborg** · 09-14-2010, 07:37 PM

Por is great stuff... But it requires prepwork, the more the better. For the best outcome you will need a bit of time and cash, but some (thorough) basic prep can still achieve good results. Knock off the initial scale, then hit it with your choice in abrasive goodness. Once thats done hit it with a blowgun and give it a good cleaning with whatever flavor solvent you prefer. If i remember right the reccomended procedure involves a light acid to etch the surface as well. I have always simply brushed it on, but have heard of some guys spraying it. I believe it is also now available in a spray can.

**Jerm1179** · 09-14-2010, 08:14 PM

id prep everything with acid before applying....the bottom side of my jeep tub and the frame are both done in POR ..its amazing stuff

**fabiodriven** · 09-14-2010, 08:17 PM

The only prep I did was knocking the scale off. It seemed to work just fine. I just brushed it on and I got a very dull finish which was fine for me, it wasn't a show truck. On the other hand, my buddy sprayed his on and he got a nice shiny show quality finish. I'm not quite sure how he did it. I wasn't there for the application.

**Jerm1179** · 09-14-2010, 08:22 PM

there are different top coats for POR that will shine it up (chasiscoat, blackcoat)...and keep it that way but in my experience it will fade as son as the sun bakes on it for a bit...http://www.por15.com/Single-Part-Topcoats/products/4/...they also have an etching primer for painted surfaces

**300rman** · 09-15-2010, 12:15 AM

yes, POR breaks down in sunlight. and any areas contaminated with oil need to be cleaned 100%. but as far as grinding, i dont recommend that. pound the scale off, hit it with a scraper, leaf-blower or whatever it off to get the dust off, then paint away.

**Dirtcrasher** · 09-15-2010, 01:05 AM

Mybe I'll do a light spray mix of muriatic acid and water before I hit it. I def. wan t to brush it on THICK! No0 spray here......

[I]'m afriad the diff mad break through, it's disintegrated over the years

but the rest of the frame is very solid..................... Just small rust areas I was gonna wire wheel the scale off with a rt angle grinder......

Hope the diff has some meat left, amazing how bad just the rear end got, maybe the prior owner had a boat?

**300rman** · 09-15-2010, 08:45 PM

Ive had excellent luck knocking the scale off with a

.....make sure the metal HAS RUST ON IT though, or the POR will NOT stick....it doesnt like clean metal, no matter how rough/pitted it is.

**Jerm1179** · 09-15-2010, 11:17 PM

if you use an etching primer first POR will stick....im not sure if its just their primer or any etching primer but its how i did my jeep tub and my old jeeps frame

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POR 15 and RUST on truck frame??