SilcaUltimate Tubeless Sealant 8oz(Return to Product Page)

I sorta wish I didn't stock up on the "old" style when it was on sale, the new stuff supposedly lasts longer which is my main concern. But, it does seal super well, even on road bike tire pressures.

I've gotten very good at the pour in method, since this type isn't injectable, but they also fixed that with the new version.

If you don't mind the pour in, stock up on this, it seals really beyond what I'd expect. Only bad part is it dries up way too fast. I put a small label on my rims with the date I did the change and just know to top it off, but again, new one fixes this.

The main thing with this is you have to pour it in, it can't get through your valve even with core removed.

It does work very well though, what I really wish they'd finally do, is sell the fiber bits as a standalone, so I can add them when I mount the tire, and only sell the sealant without the fiber bits, so we can inject it and not make a mess. Or, we can put more in if we want, or maybe add them to another brand sealant if we want, but either way, sell the fiber bits. Otherwise we're using glitter, or black pepper, or whatever we are all doing to clot holes faster.

Seems to last ok, but isn't great. It shouldn't be though, because if it lasts long, it's watery, and won't clot. If it's too thick, it seals everything but is dry in a month.

Works though.

Works very well, I'm actually shocked how well it works. I've also used just the replenisher as the primary sealant and it also works, but it was a small poke, nothing serious.

The first step version has carbon braids in it, you can't inject it. So you have to break the bead of the tire, pour it in, get the bead back on, etc. It's invariably a mess with a road bike tire. It looks nice and easy on a video when someone uses a MTB tire, it's not that way for a road tire. It's SUPER sticky too, so rub it hard with a towel or wash it right away.

The replenisher you CAN inject, but it will gum up the valve. I put a drop of chain lube (oil based) in the valve after then of course pump the tire right up, and it seems to help with that.

I really wish it wasn't so messy to install. I ideally want them to sell just the fiber strands, so we can pour them into the tire, seat it, then inject sealant. I really hate disturbing the tape of a rim, that's my main issue. The mess I can handle outside, but still, I want it cleaner.

But, even with all of this, it works. I've gotten cuts in my GP5000's and while it spews all over your bike, it will seal anything normal road debris ish. I don't cheat my road bike onto gravel and then complain about it, just road bike stuff.

Worth it, works better than normal stuff with glitter or black pepper sprinkled in for sure.

Easy to use doesn't smell to bad.

No flats so far.

recommended seals very quickly!