Hi All,

New to this forum- but I have a question. I received this tire (https://i.imgur.com/y1Z1U.jpg) from an online dealer yesterday. It has a sidewall gash. I'm wondering if there is any material i can fill the gash with that would breathe new life into the tire?

It's brand new and the company has been generous enough to send me a new tire at no charge to me, so it's not pressing, but I figured, if there would be a way to fix this...it'd be cool.

thanks,

Easiest way to fix, is to find the nearest bin, and place in there; any major side wall damage like that is the end of the useful life of the tire, no matter how old or new.

Your pix is too fuzzy. If the opening is a cut, and the carcass is cut, the tire is nearly toast. Minor nick to the carcass: boot the inside, shoe goo or
goop the outside and use it on the rear only. If the opening is a manufacturing defect in the rubber alone and the carcass undamaged, just goop
the hole and use as usual. "minor nick" means only partial thickness cut to a few threads. If the area bulges even a tiny bit under pressure, trash
the tire. Sdewall damage can be minor or significant and not be a lot difference in appearance. Many tires after a 1000 miles or so will have a
few nicks in the sidewall from hitting rocks, for some riders this is instant toss but my experience is that a few mm long cut that doesn't penetrate
full thickness or bulge is safe. Your case depends on what the carcass looks like inside and out.