The entire underbody of my car, including the wheelwells? I'm thinking I might be able to get away with 1 quart, but should i go ahead and buy 2 quarts just to be safe? Should I give the surface any other prep besides cleaning the major buildups off? I was thinking about taking some 120 grit sand paper and sanding the surface a little bit just to make sure the paint sticks good. If yuo have any tips, let me know ASAP, I want to buy the stuff today if possible! Thanks!

 

If you want to do the POR-15 perfect, then buy the Marine Clean and Metal Prep bottles. Marine Clean removes all residue; Metal Prep removes rust and leaves a zinc coating behind. (Zinc prevents rust, and gives the POR-15 extra "bite" into the panel). Then do the POR-15. It'll take longer, but you won't have to worry about the POR-15 sticking.

I used their super starter kit for $20, which came with small cans of cleaner, metal prep, and por15. I used it on my rear axle, and it came out great. I brushed it on- and it was very easy to brush on. The POR-15 flows thinly, so you can get an even coat, and the brush allows you to "stab" at sunken rust spots.

Wear Long Sleeves and Goggles!!! I had little black specs all over my arm from the brush "flicking". Hell if you're upside down, wear a hat and a turtleneck. Brake Cleaner (used quickly) will remove POR-15 from concrete... try not to spray any on your work. (I sprayed the cleaner on a rag and then used the rag to clean the concrete.)

I wouldn't sand the area with 120 grit paper. POR-15 needs some rust to grab onto, or, a zinc coating. Their instructions recommend just using a wire brush to remove loose scale. Good luck, let us know how it goes!!! Oh and I think their website gives guidelines, as in, how many cubic feet a can of POR15 will cover. I'd go for 2 coats; I put 2 coats on my axle.

 

Thanks for the info. How much of that can did you have left after coating your rear axle? Iv'e already got a can of metal wash from Eastwood that I think does about the same thing that por-15's does, so I can probably just use that. I currently dont have any rust under my car, I just want to stop it before it eventually happens. How many square feet do you think I need to cover? I'm thinking there is probably about 50-60 square feet of surface to cover (Entire underbody and wheel wells). 1 Quart of Por-15 covers 96 square feet, so I think I'll just go ahead and buy that, hopefully it'll be enough to cover everything twice.

 

Hey Tom, do you have any pics???

 

Scott, are you sure you want to mix-and-match suppliers? What if the POR-15 doesn't like the Eastwood stuff? (Eastwood has their own type of por15, I think.)

I'll try to get a pic or two of the rear axle up tomorrow, in the "por15 pics" message.

 

I wouldn't mix and match brands either. While you can often get away with it, if there is a problem, you'll really be sorry. Get the POR brand prep, and save the Eastwood stuff for another project.