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Well yes, Chris, even with the best canvas this can happen. But I suppose I just meant that to keep it happening to a minimum I do my best to avoid it. But in the event it does the only options are scrape it off or cover it with more paint or let it stay as a happy accident. Personally I do not like accidents so I always buy pre-primed linen then apply 1-2 coats of gesso then sand the surface and then really inspect it before I start. I never just stretch a canvas and them start to paint. And if there is a bump or area I missed, since I prepared the surface, there is no one to blame but myself.
Also, I use cheap duck canvas for studies and oil sketches and even on this inferior surface with some preparation it can be avoided or kept to a minimum. I really fill the weave with my ground so just a hint of the weave shows. I always use gesso now but lead primed is nicer to paint on I just don't want to deal with the lead and the dry time. Also I can use some acrylic mixed with the gesso and get a tinted base that is dry and ready to work on in a few hours not days.
Well, I am getting off topic so maybe someone else has a trick I do not know about.
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