The Eastwood coating is designed to inhibit existing rust, so what you described should not be the case. That said, I'm only going by their marketing claims, so who knows. The long-term reviews I've read have been positive, as far as I can tell.Problem (in my opinion) with Eastwood coating or similar is if any rust was under the coating it would be able to continue while the coating prevented any way to stop it. Until a big hole opens up in the frame. With the FF or cosmoline used you could still inspect for new rust and treat it. So having to re-coat inside the frame every few years is almost a good thing to me. 1 small crack or missed spot with the Eastwood and rust grows hidden from view.
This is a proven method for sure. Know first hand and know people that do this and are rust free. It can be very messy and it will drip for a week or so even if you drive on a dusty road.So I cleaned and flushed all the loose dirt and rust flakes out of mine and drilled drain holes. I use the cheaper alternative to fluid film aka used motor oil. Haven't been able to find a single rust flake since I started treating it with the oil.
It's not really a paint as it is a chemical that changes the molecular compound of the rust so it doesn't spread like cancer. I've used it before and it does work. After it dries I will normally use undercoating on the rusted treated metal as another step in the protection process. Normally I get me vehicles undercoated and then get under them and go over what the dealer didn't undercoat. I live in the upper Ohio valley where if you don't get you vehicles undercoated all you are doing is decreasing the life span of the frame/body/fuel lines/brake lines.I'm skeptical about painting the inside of mine, painting over rust is bad. I personally would be scared to use the Eastwoods in fear of trapping moisture. Prepping and painting something I can see is hard enough, the inside of the frame I just don't see how.
So I cleaned and flushed all the loose dirt and rust flakes out of mine and drilled drain holes. I use the cheaper alternative to fluid film aka used motor oil. Haven't been able to find a single rust flake since I started treating it with the oil.
This is kinda where I'm at too now even though I'm not sure logic the follows entirely ha. I like the FF/oil options better now than the Eastwood option but I say that not having actually used it. I'm unclear though about what those options do or don't do to areas already experiencing rust vs. the Eastwood option.While I appreciate the fact that people see no new rust with the Eastwood product, my thought is how would you know? There is a coating covering (hopefully) everything. It could be rusting underneath the coating and you wouldn't know until it came through the frame. I've used several "rust reformer" brands including Eastwood's and every single one had rust come back thru. Using each one's directions. With FF or even motor oil you are able to see if rust is under control or not. So you can continue to keep the frame treated. On the OUTSIDE of the frame is different. You can easily see if rust is still active under paint or any coating. I was 100% going to use the Eastwood in my frame until I was reading others opinions about it. Changed my mind completely. And if you are unhappy with the performance of the FF you can just pressure wash it out and try the Eastwood later if you feel the need.