One of my SV brushes cracked as well. But I did the electrical tape trick, and still use it. I've gotten a couple of years out of it already. Even if it crapped out now, I would buy another one.
i have been using the SV brushes for about 2 years now and have had to only use two in rotation, one for wheels, jams and the other for emblems and trim. the wood handle snapped in half before the plastic even cracked. they get so much use the hairs are really short now on one of them. ive also left mine in the bucket of water more than a couple times.....certainly worth the price That being said i recently purchased the raceglaze set and am very happy with them so far, couldn't help but try something new
I bought 2 Zymol brushes and one of them broke like your SV brush. I don't know why broke, because I've used with careful.