303 Rubber Seal Protectant for Weatherstripping, 3.4 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.

This is one of the better products I've ever purchased. I originally bought this to recondition the seal around the moonroof of a vehicle that is parked on the street and exposed to Southern California sun and salty coastal air year-round, and has been for 16 years now. I was quite pleased with the result... and a bit surprised. I wasn't expecting the product to affect the moonroof's operation, but there's no more sticking or "pop" when it opens. So I started using the product in other places, too, like the rubber strip along the windshield cowl and the door & rear hatch seals. All show marked improvement, i.e. restored color and more flexibility. The only thing I don't like about this product is the applicator. For me, it takes quite an effort to get the flow of liquid going. Once the flow starts, it pretty much stays constant afterward; but once you tip the bottle right-side-up, you have to go through the process again. The foam pad on the applicator also turns black as you're applying the product, which can't be great for for it (but does show that the product is working, removing accumulated contaminants). Those are minor inconveniences, though, and not indicative of the product quality and effectiveness, both of which receive high marks. The bottle seemed small when it first arrived, but I only ended up using about half of it on the entire vehicle (a midsize SUV). I won't hesitate to buy this product again.

This product refreshed the door seals on my 2018 Sierra. No more wind noise!

Super easy to use. Compatible for pretty much any car. Seems to have reduced noise and draft inside the car. As far as I can tell, this a good quality item that’s great value for your money.

The rubber seal protection on my Corvette is beyond my expectations and rejuvenates the seal around my windows on the rubber seals and helps prevent leaking of water inside my Corvette and prevents drying out of my window seals

Another great 303 product. Keeps seals soft and flexible

Product is good. But the foam applicator separated from top of bottle after first use. Would prefer a spray top using with clean rag. As of now - my bottle is somewhat useless without applicator.

Applied this to my car’s rubber door seals, and they look much better afterward. It helps keep the rubber soft and clean without leaving a greasy residue. Easy to use and definitely worth having for regular maintenance.

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.

最高に良いんだけど 購入追加したらus amazonにキャンセルされた🤪

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!

Conditions seals on convertible roof. Used it twice so far.

We love it. We used it on the rubber around our 40 year old windows and it worked fantastic.