B’laster Surface Shield Anti Rust for Metal – Rust Prevention for Tools, Equipment & Moving Parts – Long-Lasting Corrosion Protection with Lanolin-Based Formula – 5 Gallon

Great quality product at a fair price Does and excellent job and lasts longer than some other products

I found this easy to apply... I initially used a brush to make sure I got into the crevices and hard angles... before going back over it with the undercoating gun. The frame on my F150 was largely rusting from the inside out... the outside looked pretty good, but the inside was a scattershot with deep corrosion (see pics).... so I replaced a lot of that metal and wanted to get a good coat of this stuff inside the frame. I used the 360 attachment with the flexible hose on the sprayer and had absolutely no problems getting all the parts inside the frame since this stuff sprays pretty easily (probably a 70 degree day). I had the truck bed off and had this sit in the hot sun for almost a month before I got everything back together. It became a more durable waxy film in that time and I resprayed everything again when I reassembled it. I didn't have much overspray and didn't waste much, I don't think I used much more than 1/2 gallon for this treatment. One of my concerns with this product is that it might be flammable if subjected to very high heat. Before trying it on the truck, I had sprayed some on test metal and hit it with a propane torch to check how sensitive it was to heat. That test turned out really good where this stuff smoked/steamed but never flared. It seemed to leave a waxy residue that continued to shed water when it rained over the next few days. It worked so well that I hit another vehicle that I was having rust issues with... but accidentally got some on some areas that I had yet to repair inside the frame. So, I cautiously welded on the area and observed good amounts of smoke/steam billow and watched as it liquefied and dripped down the frame rail... but no flaring. It seemed to pass that test quite well, too.

This stuff is great. Used fluid film for years and switched to this product. Apply once in the fall on all the vehicles. Highly recommend over traditional undercoating that locks in moisture and hides the rust over the years.

Used it today on my 2025 Outback. Went on easy and sprayed well with air sprayer. Respirator and goggles necessary.

Works great. I have used it in fairly cool weather - bring it indoors so it gets nice and warm and it flows and sprays just fine. I use it in my Wool Wax gun. Friends and relatives are using it on their vehicles now. It seems that a gallon per vehicle is about right to do a thorough job. Exposed underside could use a touch-up in a year or two if you drive through a lot of rain. I also use it on my trailers. Unlike some similar products it does not leave a nasty lingering odor. Nice all around.

Works my son put on the car and is working as under coat to protect the car from rust.

Very easy to use, and easy to wipe off with degreaser if sprayed onto the paint. They have designed this normally gross globby oil to be rather easy to work with and spray. Has better water resistance than other brands. Won’t spray off with a pressure washer so you can actually spray down ur fender wells during winter time, other brands will wash off (Fluid film, Krown, Woolwax)

Awesome product.

Did not use it yet, will undercoat my trucks soon, but from what is said about this product online, and my own experience with other products, I have no doubt this is the best product out there right now!! Yes, better than fluid film...