B'Laster 表面シールド 完全腐食保護 長持ちする自動車下塗りアプリケーション用 5ガロンバケツ

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...

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.

Bought a gallon of this in 2024, and applied about 1/2 of a gallon to the underside of my Chevy Silverado. Used a woolwax spray gun to undercoat, and the flex extension to do inside the frame as well. Made the mistake of waiting until late November, so it was very cold, but still worked, it just took longer and needed more air pressure.. Didn’t get to apply it in 2025, and bought the 5 gallon this year to do family cars. Redid my truck today 8/16/2025, used about 1/2 gallon again. This time it went on much easier as it was a warm day. I probably put it on thicker than i needed too. I was happy to see the 2024 coat was still mostly there, only missing off the bottom and sides of the frame and places that get a lot of road spray. This stuff seems to never fully dry, and hold its place really well. I only got drips in places I sprayed way to much on. I would recommend coating once a year for the first couple of years, and then you could probably go every other year unless you get undercarriage washes often. I would also just get the regular natural color as it goes on mostly clear, as overspray IS going to happen and the black version may stain your garage floor or driveway. Also it doesn't have a strong smell like some other brands, so you dont end up stinking so much.

DIY install on my full size truck and a Subaru Outback… 5 gal purchase… provides superb protection from snow and salt brine used on the winter roads here locally… Applies without fault when used as instructed with proper application tool and air compressor at 60 psi… Wear protective garment and PPE as it is a messy job. Not inexpensive via 5 gallon purchase but cost effective. I do highly recommend this brand.

Way thinner then other products FF... GOES on easier...holds longer... Its a MUST for any vehicle in the north