If you've spent any time at a motocross track or hanging out in a busy bike shop, you've probably seen a bright can of silkolene pro prep sitting on a workbench somewhere. It's one of those staple products that riders seem to buy by the case, and for a good reason. It isn't just about making things look shiny for a photo—though it definitely does that—it's actually one of the most practical tools you can have in your garage if you want to keep your bike from looking like a heap of junk after six months of hard riding.
I remember the first time I used it. I'd just finished a grueling wash after a muddy Sunday session, and my bike looked okay. The plastics were a bit faded, the engine cases looked dull, and it just didn't have that "new bike" feel anymore. A buddy handed me a can of Silkolene and told me to spray it over the dry bike. After a quick wipe, I was sold. It looked like it had just rolled off the showroom floor. But there's a bit more to it than just a pretty finish.
What Exactly Does It Do?
At its core, it's a high-quality silicone-based spray. It's designed to leave a thin, protective film over pretty much everything except your controls and brakes (please, for the love of everything, keep it away from your brakes). It was originally formulated for the racing world, where looking professional is part of the job, but it's become a go-to for hobbyists because of how much work it saves you in the long run.
The way it interacts with plastic and painted surfaces is pretty cool. Over time, plastic gets these tiny microscopic scratches and pores that trap dirt. That's why an old bike looks "gray" even when it's technically clean. The silicone in the spray fills those tiny imperfections, which levels the surface out and lets the light reflect off it again. That's where that deep, "factory" shine comes from.
The Secret Weapon for Muddy Days
While everyone loves a shiny bike, the real magic of using silkolene pro prep happens the next time you ride. If you're a mountain biker or a motocross rider, you know the pain of trying to pressure wash dried mud off a bike. It sticks like concrete.
If you apply a light coat of this stuff to your fenders, engine, and under-guards before you go out, it creates a slippery barrier. When the mud hits the bike, it has a much harder time bonding to the surface. I've seen guys come off a track with twenty pounds of mud hanging off their bikes, while the guy who used a prep spray has half that. When it comes time to wash it, the dirt just slides right off. You're not standing there for an hour with a brush scrubbing every little nook and cranny. It honestly turns a two-hour cleaning job into a twenty-minute one.
How to Apply It Like a Pro
You'd think spraying a can would be self-explanatory, but there's a bit of an art to getting it right without making a mess. First off, make sure the bike is clean and dry. If you spray it over wet plastic, you'll just get a streaky, oily mess that doesn't bond properly.
I usually start from the top and work my way down. I'll spray a light mist over the top of the mudguards, the side panels, and the radiator shrouds. You don't need to drench it; a little goes a long way. Once it's on there, I let it sit for a minute or two. Then, I take a clean microfiber cloth and lightly buff it. This is the key. If you just leave it to air dry, it can sometimes look a bit patchy. Buffing it out ensures an even coat and gets rid of any excess that might attract dust later on.
One pro tip: if you're spraying it near the engine, try to do it when the engine is cold or just slightly warm. You don't want to be hosing down a piping-hot exhaust pipe with an aerosol spray for obvious safety reasons. Plus, it smells a bit like cherries (or at least, that's what I always think it smells like), which is a nice change from the usual smell of degreaser and old oil in the garage.
Avoiding the "Ice Rink" Effect
I have to mention the safety side of things because it's easy to get carried away. Silicone is incredibly slippery. If you get it on your seat, you're going to be sliding off the back of the bike the second you touch the throttle. If you get it on your footpegs or grips, your feet and hands will be slipping all over the place, which is actually pretty dangerous when you're trying to ride.
The biggest "no-no" is the brakes. If you get even a tiny bit of overspray on your brake discs or pads, your stopping power will vanish. I usually wrap a clean rag around my brake calipers or cover the discs with a piece of cardboard before I start spraying anywhere near the wheels. It only takes a second, and it saves you a very scary moment at the first corner of your next ride.
Beyond Just Plastics
While it's famous for making plastics look new, I've found that it's great for other parts of the bike too. It's excellent for keeping rubber hoses from drying out and cracking. I'll often spray a bit onto a rag and wipe down the radiator hoses and any exposed wiring looms. It keeps the rubber supple and prevents that "crusty" look that older bikes get.
It's also surprisingly good for the underside of the engine. Mud loves to bake onto the engine cases, and the heat makes it almost impossible to remove. A coating of silkolene pro prep helps prevent that "baked-on" staining. It also displaces moisture, which is a fancy way of saying it pushes water out of places it shouldn't be. If you've just washed your bike, spraying this into the little bolt heads and crevices helps prevent that annoying surface rust from forming overnight.
Is It Better Than the Cheap Stuff?
People often ask if they can just use furniture polish or some cheap silicone spray from the hardware store. Look, you can, but there's a difference. Cheap sprays are often much thinner and use lower-quality solvents that can actually degrade some types of plastic over time or leave a sticky residue that acts like a magnet for dust.
The Silkolene formula is specifically made for the high-impact, high-heat environment of powersports. It doesn't get "gummy" when it gets hot, and it stays on the bike even after a bit of light rain. In my experience, the cheaper alternatives might look good for ten minutes, but as soon as you hit the dirt, the dust sticks to it so badly that the bike looks worse than if you'd done nothing at all. With this stuff, the finish stays "dry" to the touch once it's buffed, so the dust doesn't cling as much.
Final Thoughts on the Garage Essential
At the end of the day, we all want our gear to last. Motorcycles and mountain bikes are expensive, and keeping them in good condition helps maintain their resale value. But more than that, it's just a pride thing. There's a certain feeling you get when you roll a spotless bike out of the garage on a Saturday morning.
Using silkolene pro prep is one of those small habits that makes bike ownership a lot more enjoyable. It saves you time, it protects your investment, and it makes you look like you actually know how to maintain your equipment. Whether you're a serious racer or just someone who likes to keep their weekend toy looking sharp, it's definitely worth keeping a can or two on the shelf. Just remember: keep it off the brakes, buff it out, and enjoy that "fresh from the crate" look every time you ride.