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.

Works great, really brought the seals on my trucks bed cover back around. Had them looking and feeling brand new

Good product, except that the foam applicator is not very resilient. It's starting to tear a little bit. Returning it at this point feels like eating more than half a dinner, and trying to send it back, so as far as it's ability to give a good appearance, it's better than Armorall, but the applicator could be a little more sturdy. JMO

Instant difference. Notice the seals soaked up the product and softer. Did two used cars at the same time.

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.

Easy to use. Worked like advertised.

I am a tad disappointed with this product because it is difficult to determine how affective it truly is. The main issue is the foam applicator - if I can’t apply it properly to all rubber seals then I can’t determine if solution made it on the seals sufficiently. When using the bottle upside down, I could tell there was product on seals; however when I have to use the bottle right side up, the applicator runs dry and it seems as though there is little to no product on the seals. It is quite disappointing given there are many seals that require me to use this bottle right side up. I ended up using a different product to go back over the seals that did not receive a decent amount of 303 solution. I think 303 has to go back to the design board on this and provide a better application method. I purchased two bottles, so I am going to try to put the solution in a different bottle to see if I can save my investment. I will not purchase this product again as long as 303 keeps the applicator.

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.

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