Undercarraige Painting?

[joesregalproject]

Well these past few weeks have brought on much more than anticipated with my Buick, but here is its current state-



Anyway, in the past few weeks the body has come off, the frame and underside have been patched in numerous places, and it's gonna be receiving a new body mounts, new gas tank and all new lines. Since I have such easy access to the underside of the car i figured I should paint and wire wheel it now. I am gonna use Rustoleum Gloss Black brush on paint. There is a lot of surface rust and scale that is underneath and while I can wire wheel most of it, some spots like in between the floor and inner rockers and the spare tire well and the inner quarters I cannot access with my angle grinder and wire wheel. My plan was just to knock off as much of the scale and loose paint as I can with a hand-held wire brush in these areas and paint over with the rustoleum. Also Some spots have a lot of factory undercoating which is stuck on pretty good and just clogs the wire wheel. I was just going to paint over these spots. Does this sound okay? How clean does the underside have to be for me to paint?

 

[tetomas]

Look at www.por15.com, it is not cheap, but will hold on when other coatings fail. I did my frame, underbody, and floorboards with it. With por 15 preperation is key, be sure to read and follow instructions. also be sure to have a well ventilated space as this stuff has some particularly nasty fumes.

 

[565bbchevy]

X2 on POR 15 I use it on most everything on the underbody and it holds up very well.

 

[FE3X CLONE]

I've used POR-15 with decent success as well as a product called Rustbullet. I found the Rustbullet more forgiving on smoother metal and generally easier to apply than POR-15. Rustbullet is UV stable without a topcoat however it only comes in silver I believe.

I coated my frame with 3 coats of the Rustbullet and 3-4 coats of Rustoleum semigloss. To get a nice finish I used a cheap Harbor Freight HVLP spray gun and thinned the Rustoleum with mineral spirits by 10%. It sprays wonderfully this way.

 

[joesregalproject]

I know POR-15 is a great product but it's a little out of my price range. I'm wondering how clean/scuffed the frame and underside of the body will have to be to get a good bond with the Brush on rustoleum. I have a Rust-Inhibitor (Defender II) which works well and I may put over some of the rustier spots and then top coat with the rustoleum. Sound Ok?

 

[FE3X CLONE]

The problem is that the Rustoleum isn't going to be enough to stop the rust and it'll bleed through eventually.

As for the rust inhibitor, just make sure you follow it's directions. There are some that will get rid of rust but you then need to wash them off prior to painting.

 

[V8 Rumble]

I used eastwoods under gone to remove the old under coating on mine and it worked great? Make sure you have a scraper or oscillating tool to remove it. It peels up with he undergone. Have wax and grease remover handy to remove any residue

I used eastwoods rust encapsulator afterwards then top coated with 3m undercoating and I have not had any issues with peeling or anything falling off and I drove it a lot over the summer. I used the red scotch pads to prep the surfaces to be coated which worked better than sandpaper. You can also use rubberized rust encapsulator which does two jobs in one.

All of this was done with aerosol paint cans. The eastwood stuff is really good and goes on better than other aerosol cans I've used in the past.

Undergone- http://www.eastwood.com/eastwood-s-unde ... mover.html

Rust encapsulator- http://search.eastwood.com/search?w=bla ... capsulator

 

[jmerc]

Just a little advice here, I know what you mean when you say the por 15 is not in your price range right now but look at it this way. The few dollars more you spend now will save you many dollars and heartache later on. The por 15 is self leveling when you put it on with a brush it looks like it was sprayed on. it actually converts the rust as well so you will not have to worry in the future. Believe it or not it spreads very easily and covers a lot of surface area. The 20 extra that you spend now will be well worth it, you have the body off and Im sure you don't want to have to take it off in another 3 years from now to redo what you have already done. Believe me if you use the por 15 you will not regret it.

 

[1979Calais]

The problem is that the Rustoleum isn't going to be enough to stop the rust and it'll bleed through eventually.

As for the rust inhibitor, just make sure you follow it's directions. There are some that will get rid of rust but you then need to wash them off prior to painting.

X2
I put 2 coats of Rustoleum primer and 3 coats of gloss black Rustoleum on father in law trailer with a brush and it did not last long in a few spots. I let each coat dry a day each, but the fifth day it rained and the paint bubbled in areas where I did not clean all the rust off . I would use POR next time.

 

[1evilregal]

sorry that I don't have any advice on this, I do have to say that I'm glad to see you still around! hadn't seen you here for awhile, and hoped you hadn't dropped away like alot of the guys we've known...