I've used Tuf Shine Tire Cleaner a lot and I've also used the Tuf Shine Tire Coating a lot. I've never had a de-lamination problem but I am INCREDIBLY weary of the problem mostly because I don't what to be the guy that has to sit on his butt in front of someone else's tire trying to remove a coating that didn't take.
When I coated the tires on this 1971 Corvette, the tires were brand new, purchased from Coker Tires. T
Review: TUF SHINE Tire Clearcoat by Mike Phillips
here was a visual issue with the sidewall of the tires, they looked like they had checking. These were verified brand new. So I held off on coating them until the owner could talk to Firestone. Firestone looked at the pictures he took of the tire sidewall and assured him there was nothing wrong with the rubber. I machine scrubbed them 2 different times. The first time when I restored the original paint and then a second time after he spoke with Firestone.
When I did apply a coating I took the precautionary step of only coating ONE tires. I discussed with the owner and he agreed. We coated one tire and let a few weeks go by to see what, if anything, would happen.
Nothing happened.
The coated tire looked phenomenal. So about a month later, when our schedules aligned, I did a quickie machine scrub to the other 3 tires to make sure they were completely clean from any road grime, (it's a garage queen), and then coated them. Have not heard from him about the tires ever since.
I too have machine scrubbed tires multiple, multiple times and have not gotten to the point where I see a frothy white foam during scrubbing. I want to see it but sometimes it just doesn't happen. My guess is it has to do with the proprietary rubber blend different tire manufacturers use.
Here's what I would do if I were in your shoes - just coat one tire.
Watch it and see what happens over the course of a few weeks to a month. If the results look good and don't change - then do the other 3.
This Wednesday night, (tomorrow night), I'm going to machine scrub the tires on my car and the wife's car and test out the new PBL Tire Coating. I've always been happy with the Tuf Shine product and also the McKee's tire coating. Andre and Bobby did extensive testing with the new PBL tire coating and they know how much I like tire coatings. The told me the PBL version is NICE.
So we'll see.