3M body schutz

[WarDamnEagle]

I had no idea there were so many variations on this theme until I went to the 3M website. Everyone talks about using their Body Schutz as an undercoating but the details that I found through my search on Mud were sketchy at best.

I want to undercoat my 1985 4Runner. It looks like I could go with quarts (part 08864) or no cleanup, high-coverage in either solvent based (08964) or water based (08804). For some reason, the "No cleanup" varieties are touted as "Best available corrosion protection for undercarriages" whereas the normal Body Schutz (08864) isn't. All of these products require an air source and a 3M No Cleanup applicator gun (08801).

08864 lists natural rubber and asphalt as the base, 08964 lists SBR rubber, and 08804 lists SBR rubber and acrylic.

They also have three products in aerosal cans that look very easy to use but may not be quite as good: 3M Undercoating (08881) , 3M Underseal Undercoating (08882), and 3M Underseal Rubberized Undercoating Black (08883). This last product (08883) is the only one of the three that list as a feature, "Excellent corrosion and abrasion resistance". It is tempting to go with this last product as you can spray it directly out of a an aerosol can.

OK a specific question is, how much of this stuff would I need to do a full undercarriage including wheelwells and frame? Their website gives no coverage information at all.

Furthermore, any advice from anyone with experience with these products would be greatly appreciated.

Thanks!

 

[62FJ40]

I want to know what you find out as I want to do the same thing to my 40. What kind of surface prep is required? I assume you have to degrease everything (no small chore on under carriage) and then do some kind of rust killer. Probably good questions for a 3M rep.

 

[WarDamnEagle]

I want to know what you find out as I want to do the same thing to my 40. What kind of surface prep is required? I assume you have to degrease everything (no small chore on under carriage) and then do some kind of rust killer. Probably good questions for a 3M rep.

If you are dealing with very much rust then I'm not sure that these are the products that you need to start with. Here is a link to all the 3M undercoating products. You can find instructions for each product there.

3M(TM) Coatings

For most of these you need to degrease (which I would do with vehicle on a rack with a steam cleaner and degreasing agent) and then use some 3M solvent (specific type listed under instructions) and then apply product (again, specific instructions for each product).

I don't have rust or at least not much at all. I'm just trying to re-undercoat (for lack of a better term). If I was dealing with a lot of rust then I would be looking at POR15 or one of the equivalent products. FWIW, I stripped, degreased, and painted my axles with POR15 and topcoated with POR15 Chassis Black. I'm pretty satisfied that they are good to go for the rest of my lifetime!