303 Products Rubber Seal Protectant, Conditions & Restores Car Door, Window & Weatherstrip Seals, Prevents Cracking & Fading, UV Protection, Non-Greasy Finish, 3.4 fl. oz

I’ve been using 303 Rubber Seal Protectant as part of my car detailing work, and it has become one of those essential maintenance products I rely on. What stands out about this protectant is how well it rejuvenates and protects rubber seals on doors, windows, hood, and trunk. I applied it to my 10-year-old car as a test subject, and the difference is remarkable — the seals look very good, feeling supple and flexible again, not stiff or brittle like untreated seals often do. For older or weather-worn seals, I noticed the original color and pliability return, which really helps maintain a tight, weatherproof seal around the doors and windows. The application is very user-friendly. The built-in foam-tip applicator makes it easy to target seals precisely without wasting product or making a mess. During application, it’s normal to see small white drops of the product on the seals, but once it dries, it leaves a smooth, clean, and well-conditioned finish. I simply wipe any excess after a few minutes — quick and straightforward. As a professional detailer, I can say this is a nice finishing touch that clients always notice. It elevates the overall look of the vehicle and adds that extra sense of care and polish that people appreciate. I find it especially valuable in hotter climates or when the car sits outside often. The product’s UV protection helps prevent the seals from drying, cracking, or fading due to sun exposure, which can save from costly seal replacements down the road. After treating my car, and a few customer cars at the shop, the difference is noticeable: doors close smoother, seals feel healthier, and there’s a lower chance of leaks or wind noise. Because of that, I consider 303 Rubber Seal Protectant a must-have for anyone serious about car maintenance or detailing. In short, 303 Rubber Seal Protectant works exactly as advertised: it conditions, protects, and revitalizes rubber seals. It’s inexpensive, easy to use, and gives a real improvement in seal performance and longevity. I’ll definitely keep using it and recommend it to others who want to preserve their vehicle’s seals.

Very good product with easy applicator. Used before and this is a purchase for restock. This stuff works very goid. I like the 303 product line.

applicator will be a pain to use upside down, otherwise it works as designed and it is great just wish I could buy it as a liquid or have an applicator to do it with the bottle standing up not flipped over as I have seals 360 on my doors.

Sticky rubber or plastic surface? This is the only thing I have found that actually works to fix that. So you know the horror of discovering something you have had for a while is de polymerizing and either becoming brittle or sticky. The brittle is bad enough but the sticky is worse as you cant use it without being reminded of what it shold feel like. So I have tried all the normal advice- soap and water (hah!), wife's makeup remover, olive oil, different alcohols (methyl, ethyl, iso propyl), Acetone, Armor All, Goof off glue remover, Goof off regular, nothing helped. In fact the regular goof off and acetone started to take off the rubber coating and made things substantially worse. I reluctantly asked ChatGPT thinking it would have no clue but it gave me some suggestions including this stuff. Its like old fashioned shoe polish- liquid in a bottle with a foam applicator on top. I tried it once and it was better. Not great but better. I let it dry and ran two more coats on it (Sweet Dell Xeon laptop from 2015) and to my amazement it solved the sticky problem and other than being glossier, its almost identical to my current Dell laptop. I beleive its a silicone based solution so it should not wash off as I need to occasionally wipe down the keyboard. I now have a whole range of stuff like tools and things that are next in line to get coated. It doesnt undo the damaged plastic or rubber due to oxidation over time and loss of polymerizers but makes the surface at least usable again. I have some automotive targets in mind as well. Fairly inexpensive solution to a vexing problem. No I didnt get it for free, I always pay full price usually after trying everything else that doesnt work but thats life.

I used this product on the rubber seals around the doors and hatch on my Subaru Outback. It helped make them more pliable and water resistant. The cabin seems to be even more quiet than it was when I got the Outback in July 2025.

This stuff works, restored the finish on our lawn furniture to like new

Not sure how good it is over time. It applied well and soaked in well but it did not keep my doors from freezing shut. Now I can't tell I ever did anything so, I am skeptical for good reason. PROS: Very watery. It is easy to apply with it's sponge tip and does not leave a big mess. It comes out kind of a white, milky color. It goes a long way. Dries fast and does not leave a greasy mess. CONS: Because it dries quickly, it doesn't seem to lubricate like a grease or silicone. (I asked the dealer what to apply and they said silicone grease but it's hard to find and expensive.) I applied it a week before rain and freezing temperatures and my doors still froze shut. I would expect something like this to keep seals from drying out and sticking.

Weather seals felt more plump/pliable 24 hours after use

Excelente producto! Lo adquirí ya que las gomas de las puertas de un coche con apenas dos años de uso comenzaron a hacer muchos ruidos con el movimiento del auto. Esto debido a que se encontraban resecas como resultado de la exposición a lluvias, polvo y un poco de sol. Una vez aplicado el producto en todas las gomas de las puertas los sonidos desparecieron por completo. Tenia mis dudas sobre los resultados de aplicar el producto, pero mis expectativas fueron superadas por completo. La textura del producto una vez aplicado muestra instantáneamente el resultado. Es un acabado no grasoso, por lo que no se pega más polvo del deseado. Es una compra que realizaré nuevamente para el detallado del auto.

Used it once so far and it seems to do what it says

Used to condition and treat roof rubbers for a vw Eos. Before treatment one area of the roof was just pouring water in during torrential rain in December. 303 was applied by dabbing and spreading over all roof rubbers for a few days. This seemed to have helped during sibsequent bad down pours. Fingers crossed for the rest of the winter!

Used it on the rubber door seals on my car. It was easy to apply with the foam applicator and seems to work well. Got rid of the annoying rubber seal against the body of the car rubbing noise.

Tested it and works well. Will continue using it