UV cure resin

Has anyone ever tried those UV cure pur and epoxy resin? I use them for spot repair and it works pretty well because I don’t have to wait for hours like the conventional resin to cure. What’s the pro and con of it?

con: you cant do carbon fiber with UV activated resins

Kind of seems obvious, but my guess is does the carbon absorb the light before it penetrates the entire layup?

What about kevlar and glass?

Just curious don’t have any intention of using the stuff myself.