RV Tire Safety: “Tire dressing” and “Do not use covers.” Where’s the test data?!


with RV tire expert Roger Marble

I’ve been following a long thread on an RV Forum on the topic of “tire dressing” aka tire treatment or “tire shine.”

The good news is that most posters knew to not use any product that contains petroleum distillate. Too bad some RV dealers don’t follow the guidelines on this. I have seen a number of display coaches almost dripping with some slippery fluid. Might be brake fluid or even motor oil, as the tires were shiny and I could scrape the coating off, leaving a “slimy” substance on my finger.

I saw a number of different products mentioned and many suggestions that a product called 303® was a good UV protectant. I saw no one provide any actual direct comparison test data for any product that would support the claim of protection against UV damage to tires.

With a little work getting through the maze of retailers selling “303,” I finally made contact with their customer service. I asked, “Can you provide any test data on 303 vs. other tire protection products. Also info on if 303 application removes any of the wax or oil or anti-ozone chemicals built into tires.” The answer was that they would ask their chemists.

This seems strange that a company making claims on the performance of their product would not have comparison data available that would back up and support the claim. Please note, I am not saying that 303 does not offer some “protection” against UV damage to tires. I am concerned that the actual application as seen on YouTube may be removing the special waxes and anti-ozonant chemicals tire companies put in our tires.

If I receive actual test data that compares 303 against other products that make similar claims I will post on this blog.

What was most concerning were a couple pf posts where the writers claimed:

I got tired of reading all the opinions on tire dressing so went to the source, Michelin. They stated that washing tires with mild soap is the only thing they support on their tires, no dressing, no covers, no nothing. You don’t see shiny tires at a truck stop and these are the people who put on the miles.”

Another said: “Goodyear RV tire guide says just keep them clean, no dressings, no covers, zip. You can use the same stuff you wash your RV with, perhaps use a medium brush on stubborn spots.

I responded: “Interesting comment on ‘no covers.’ Wonder what Goodyear RV guide you are looking at?”

I found in THIS Goodyear RV Tire Guide and under storage is the advice to store tires “in sunless area” and “Don’t store tires where they are subjected to direct sunlight or extreme temperatures.”

Based on the above, how does telling us to not use tire covers make sense?

I have confirmed with actual test data that covering tires can reduce the tire temperature by about 40° F, which could extend tire life by many months, depending on how long you protect them from artificial heat aging.

I checked and found just the opposite on the shielding from the sun. In fact, I even contacted an Engineer at Michelin and he said, “Our position regarding tire dressing and protection has not changed. It is still recommended that tires are cleaned with a mild detergent and water, and they are protected from direct sunlight when the vehicle is parked for extended periods of time. This is usually accomplished with the use of some type of cover.

So I don’t know where the “no cover” info from either Goodyear or Michelin comes from, and if you read my blog you know that this tire design engineer is a strong proponent of using white vinyl on Class B and C tires, and the flat mesh of any color on Class A.

I have nothing against 303®. But I am wondering why, for the price, they don’t have any actual direct comparison performance data on UV protection.

P.S. If you don’t want to protect your tires from the heat aging due to sun exposure please don’t ask me to explain why you don’t get longer life from your tires. Also next time you run into someone selling any brand of “tire dressing,” ask to see the test data and see what happens. (If you get test data, please send a copy to me.)


Read more from Roger Marble on his blog at RVtiresafety.net or on RVtravel.com.



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Robert Perry

Switched from doubles to individual tire covers. Sooo much easier to put on and take off. Open in the back. Moisture has never seemed to be a problem.

steve s.

Roger, here is the data sheet I was able to find for 303 that was updated in 2015:

I found it humorous that many / most ingredients are listed as proprietary, and lower down the ‘Conditions to avoid’ section indicates ‘Close proximity to incompatible substances’,
as if we even knew what that was!

Anyway, hope this helps.


Rick Sorrenti

Ref. Tire Dressing. The real question is will 303 do any damage to the tire! Many owners dress tires for ONLY the appearance aspect. Personal experience is I have used 303 Aerospace Protectorate for 15 years on multi million dollar aircraft and RVs and have never seen any degradation of tires. This is verified by ANNUAL FAA inspections of the aircraft.


Hi Roger.

A little off topic maybe but please include your input regarding age of tires. All tires have a production date on their sidewall and I don’t trust a tire that’s over 7 years old on anything I own. With age tires become hard and don’t stick to the road like they used to, regardless of tread depth. To me that’s a safety issue.

Also, it’s surprising how much tire pressures increase when the sun’s on them. Using plywood to protect tires from the sun gets my vote as vinyl traps moisture and promotes mold and corroded rims.

My 2 cents for what it’s worth.

Cheers, Jim

ThreeQuarter ton

I worked in a tire store in the mid 60s. At that time tires were coated (SHUDDER) with a mixture of tar and gasoline! Of course tires didn’t last for long back then. I have an old dually out back, the steer tires are at least 20 years old, the rears are probably 30 years plus . I would be as comfortable using these tires as I would the tires on my car which are 10 years old, because the car tires are more weather cracked than the trucks.

Phil Atterbery

Thank you Roger. Most of my tire experience is in military aviation on big 4 engine aircraft. The tire OEM’s don’t allow protectant either.
When I encounter a proponent of tire dressings I don’t even argue the point. It’s his money to waste. Keep’em rollin’ Roger.

Gary Broughton

Used tire covers for awhile and then had wet tires and rusted rims.
Quit using them and changed tires at about 50000 miles or 7 years.
Only had 2 flats on my trailers in 45 years as I took care of tires and kept them properly inflated.


It would be neat if someone could invent a window shade of sorts that you could pull done to cover your tires when you park. When you leave it would store safely up in the wheel well area


Seems like soap and water will remove more of the waxes and oils in the tire than a wipe on 303 protectant.


I can’r remember where I read the article, but putting covers over your tire helps with the heat, but not with UVA! UVA can penetrate most fabrics. I’m sure someone know for sure & will post what they know!


Is there data, or has a study been done that shows tire dressing is harmful to tires? I have used all types of Tire dressings and cleaners and have routinely exceeded warranty mileage with no visible sidewall defects.

Joseph Weinstein

Thanks for the information. I am guilty of using 303 for my entire trailer. It seems to be a favored coating by many of the old timers. I also use tire covers. I don’t plan on keeping my tires more than 4 – 5 years and don’t believe that coating them 4 – 6 times a year is going to have any detrimental affect. I worked in the automotive repair industry when younger, when technology wasn’t anywhere close it is today, and never had any customer complain that dressing tires resulted in any deterioration. I am sure that it does occur in labs and in some people that might overuse it, but my gut says enjoy what I am doing and just keep inspecting the tires prior to, during, and after every trip.

Tommy Molnar

I got tired of tire covers going to pot in short order due to the hot sun here in NV. And also, spiders loved to make their home under my covers. So I got some old plywood, cut it to size (one for each wheel), painted them white, and now lean them up against the tires when parked in the yard. Works great.


The other reason I use the vinyl covers is to keep dogs from peeing on my aluminum wheels! What is the deal with dogs and wheels?
My covers have plenty of pee stains…


I wintered in AZ and the sun was brutal. Tires were very hot so I ordered from Amazon a set of covers for the tires. They were very lightweight and aluminum colored. Never did the tires get hot again. Love em. Better than white even.

Ed K

Why the different recommendations between Class A and Class B & C tire covers?

Tom Smithbrother

Great article