Permatex 81756 Rust Dissolver Gel, 8 oz., Red

I have used this on a few things that I had already tried several different rust penetrants on with no success, & this just flat-out WORKS! You have to follow the directions! It will tarnish the metal if you leave it on too long & don't wash it down with water as instructed to do. I now have hope that I can get the front brake lines loose on the Dakota I bought that had apparently spent part of its life up North in the rust belt. HOWEVER, I just can't FATHOM WHY they didn't include a BRUSHED CAP! It's a gel that HAS to be applied with a brush, so why not supply it IN the bottle?! That's a glaring oversight in an otherwise GREAT product! I bought some cheap watercolor paint brushes to use for this.

I'm somewhat impressed! I used it on my boat trailer (rusty springs, hubs, etc), and it worked nicely! I "painted" it on with a brush, let it sit for about 30 minutes and then applied another coat, lightly brushing it into the metal to ensure it was in every nook and cranny. After letting it sit for another 30 minutes, I hit everything with the garden hose. Much of the metal was rust free, and what wasn't, I can very easily paint over. Note: It is advertised as a gel, but is more of a thick liquid. Still stuck nicely to wherever I put it.

Very strong solution and works fast.

Removes light rust on most items, including automobiles. Decent price.

The other day I decided to replace the spare tire on my pickup truck because the tire was cracking and showing other signs of deterioration because I hadn't used it in over a decade. Since the tire and rim are located under the bed of the box, I don't take the assembly down unless I need to—all I ever do is check the pressure of the tire to make sure it's inflated. Well, when I lowered the assembly I noticed that the steel rim was severely corroded. I took the tire off the rim and got out my 4-1/2" grinder, with a wire brush attachment, and removed the bulk of the corrosion. Afterwards I used this Permatex 81756 Rust Dissolver Gel to coat both sides of the rim. Per the instructions, I left the product on for 10 minutes and then washed it off with water. I then let the rim air dry for 24 hours. When I next checked the rim it no longer appeared rusty. It looked more like some kind of primer coat had been applied with a dusting of a white powder. I brushed off the powder and applied a coat of primer designed for rusty surfaces. I let the primer dry overnight before applying a couple of coats of paint. Since I just did all this work, I can't attest to how well this gel actually performs in the long run. I can say, however, that it seemed to 'convert' the rust on the rim into a state that allowed me to apply primer and paint without any problem. I will most likely update this review sometime in the future depending on the long-term performance of the product. Thanks for reading!

This is the first time I have used this product, and I am liking it more and more as I work with it. I am getting good at estimating the correct amount of time to leave the product on based on the level of corrosion. It's a semi-thick gel and stays where you brush it without dripping. It rinses off fairly easily however, so I like using this product. I did not have access to a water hose for some of my projects, and the gel came off fine when using water from a pump sprayer. It's not overly aggressive when left on for a few minutes. It couldn't completely clean some heavily rusted shackles, but got enough off that I could finish the job with a wire brush and electrolytic bath.

It works okay, took several applications to remove most rust that was hard to reach with abrasives. I can see it to be useful in certain instances. I’ll keep it , but won’t purchase again.

This easily removes rust. I have used it many times. Once dry, can be painted or oiled.