Blaster Surface Shield Black Series, Professional Automotive Undercoating for Rust Protection and Corrosion Prevention, 1 Gallon Pail, Pack of 1

Easy to apply, messy to touch since it stays viscous. But protects bolts/nuts and allows easy removal compared to being potted in asphalt undercoating. Best rated product according to “Repair Geek”. Like they added black version. Ever notice how frame doesn’t rust where oil has been. Same principle. They have rattle cans too, but got spray kit and treat multiple vehicles.

This seems like decent coating. Goes on easy, although it's messy. I'm trying to stave off some rust and rusty frame damage on my 2009 Ford Escape. Luckily the sub-frame/engine cradle is still intact, so I'm using this to keep it that way. The black color goes on easy, and you can see where it's going, which is good. The black seems to coat better than the clear, which comes out with a little more "foaming." So I'd definitely recommend black for undercarriage application. I put it on in low temperatures (about 32°F, so right about freezing point.) It doesn't seem to "creep" as others have mentioned. But that may be because it was cold out. I bought a six pack, with the trigger button spray nozzles. I did the back half of my small SUV, and the inside rocker panels with four cans. Granted that was also spraying inside where the frame was rusted away. I plan on doing the front frame, and suspension parts this coming weekend. I believe when it's finished, I'll have used between six and eight cans. It's messy. Even avoiding a lot of overspray, it drips off the vehicle, and lands on the ground. I used a sheet of cardboard to catch the drips when applying, and after they initial drips fell, no more seemed to fall. So you can move the cardboard/tarp/etc around to where you're actively spraying. I can't talk of the longevity yet, since I'm only on day two, and it's been at or below freezing. But I can say areas I sprayed with a decent thick coat appear to have thinned out a little. So I'll be on the lookout for areas where the spray "thinned" itself out. I'd definitely recommend this product. As other reviewers seem to love it. And it's good to get some kind of coating on the rusted metal. (I wish I knew about this stuff years ago. I have to junk a Ford Taurus because the frame essentially rusted in half.) I'm leaving some photos of before and after. If anything noteworthy changes, I'll update this review. I'm in Michigan. So pretty much the worst area for weather and salt/road damage.

Good quality and value. Completely did a thorough job on my truck in one day. Why pay thousands when you can do it yourself!

Watched a few videos and applied today. Went really well and the black really did make the frame that had light surface rust look nice and black. Happy with the purchase. Live in south so don't expect it will get a good winter and salted road test but confident it will help keep things easy to service and looking good

Absolutely best way to purchase this product! Sprays super well and protects nicely!

Easy to put on doesn't spread creep like some I've used

The cans are great but I had a few issues trying to get it to spray? Other than that they work perfectly!!

Put 4 of the 17.5oz cans on 2 of my vehicles -- each vehicle used 2 cans. Got most everything covered, could probably use another can per vehicle to get almost 100% covered including inside some frame rails. Going to hit the remaining portions when I have them up on ramps -- so 3 cans per vehicle for very good coverage. Don't keep spraying until things "look black" or you will overuse -- just spray as you would the non-black version and the "creeping" will spread the product nicely out after about 24 hours. Warning: make sure to cover up - like wear a hoodie & gloves. A filtered painting make is probably also a good idea. Also do not apply in a closed space -- do it outdoors. I see NNKH on YouTube use Blaster products all the time, so this time I switched from Fluid Film, plus great price for 6x17.5oz cans.