Automotive Spray-On Rubberized Undercoating Material, 1-Gallon RUS-1020F1

Undercoating is great with very thick and stable coating properties. Easy to spray multiple coats and fast drying. However, make sure you purchase disposable sprayer since this stuff is like a spray-bomb. Overspray go's everywhere; on vehicle, you, dogs, cats, ground, house, and down the driveway. Make sure you are 100% covered with disposable clothing, gloves, goggles, head covering, face shield, etc.; you will absolutely be covered in black tar-like substance that is only removable with solvent. Best to just throw away everything involved in spray process. Do not get any of this stuff on exhaust, mufflers, or any other vehicle components that get hot; will produce nasty vapors for months after job. Also, coating is heavy so stay away from vehicle rotational components unless you like vibrations from out of balance driveshafts. Do not make mistake of thinking you can spray coating in any precision manner; cover, mask, and tape areas not to be coated. Procure sprayer with extended nozzle (say 5" or so), this will allow coverage of hard to access areas, and insertion through undercarriage access holes and inner frame areas. Place large cardboard sheet over driveway unless you want large, permanent, sticky black spot.

I've used RusFre undercoating for two decades. It makes a mess, never comes out of clothing, and takes some scrubbing to get it off yourself, but it works great. I run tractor trailers in the northeast, so they're swimming in road salt and corrosive de-icer six months of the year. Rust jacking (rust build up between parts) is a real problem, and can break parts if allowed to fester. I coat the mating surfaces with RusFre any time I replace a part. It eliminates rust jacking virtually 100%, and in the rare cases where it doesn't completely stop it, it slows the process tremendously. It stays on surfaces permanently. A factory-applied frame paint on a truck I bought new was mostly reduced to rust and rot after less than six years. I sandblasted everything, coated all the parts individually with a high quality rust preventative paint, then coated everything again with RusFre. It went through five New England winters after that, with zero visible rust.

Don't get just one gallon for your car, I put over 2gallons onto a Ford Focus and came out great. Be sure to get 2 or 3gallons for a NEW car with 4 doors. I thinned it down some (mineral spirits) and used my own homemade hose-spray head. Made my spray tube using some 3/8"ID vinyl tube that I heated end and melted it flat-closed. Then heated a small nail to poke/melt holes into the flattened end at different angles (Pattern like a "5" on a dice" on both sides with some poked into the flattened ends too. it made fine mists and directional into the corners of frame. Be sure to buy some Tyvek jump suits with head coverings; cheap latex gloves, plastic sheeting to cover over & under the car. Also tape up the seams from hood & fenders so spray does not get onto finish. Pull inner fender liners and bumpers to do it right and get car up as high as possible. I used a gun that was "bought with" this stuff and worked well with mods. However the 3M spray tube (bought with) was worthless as it was way too stiff, kept kinking and causing air to blow material out gun breather hole all over me/car. Lastly use full face shield with tear off liner/shield so you can see when overspray gets on you.

This is some pretty good stuff. It creeps into the crevices and covers extremely well. It dries nice and black with a semi gloss finish. I got a really nice uniform texture using a 3M Schutz gun at 60 psi. The only reason I knocked a star off is for excessive dry time. It took 4 full days in 80 degree weather with a fan on it before it wasn't tacky anymore. If you can cope with the dry time, this is what you want.

It is great I should have got 2 gallons you can’t find a better deal then this

We bought this to refinish/stop the rust on our 16ft livestock/cattle trailer. We wire wheeled, sanded and then did a coat of rust converter as base. We also added rust oleum paint on outside and decided to rubber/undercoat bottom of trailer where the gravel hits as well. We used the product undiluted with the recommended gun (do not use the multidirection attachment!) with portable air compressor at 110psi pressure and disposable suit and face mask as suggested in other reviews. We have just finish applying but are pretty happy with the results so far. We used almost 2 gallons to do frame/supports, 1/3 of outside and 3/4 of inside. I followed my husband with roller against tape line to avoid overspray on top of outside of trailer and the product was already drying on a 70deg day. So it seems that the other reviews for extended dry time was due to thinning the product... that is not at all necessary and went on smoothly right out of container! The product came shipped with the containers sealed well and cushioned in box to avoid spills and punctures. It is a sticky mess to have on your hands but cleans up well with gas or paint thinner if you accidentally get a little on yourself. All in all we are happy with our wknd project (took a few weeks) and hopeful with the durability of the product. We will certainly buy again for future products!

Great under coating I been buying this product for a few years . I have a friend who has a garage does inspections an fixs cars an old classics he asked me where I got what's the name of under coating he said it looks like a good product he was going to buy some