if its a big messup i usualy try to get the alcohol to it fast, if that doesnt work which it usualy doesnt, because once industrial sharpie dries fully, about 30 seconds its there for life no matter what u have to take it off, unless u want the base paint gone too. otherwise i just turn the messup into another peice of the design.
You've got some serious skills. Learn to market yourself well and you can make some good money with your talent. Don't sell yourself short! If people won't pay more than $300 for a frame, then you need to figure out how to do it faster. And if you can't do it faster, you need to figure out how to charge more! Seriously... people will pay for quality work, and this is quality work!
your a fuckin retard bro you wish you could do this kind of artwork...fuck i wish i had 300 bux id so get this done to my bike, nice artwork radrider, i may message ya sometime in the future to get something done to my frame