Karin, the prestretched canvas I bought for a portrait commissioned of our governor turned out to have a flaw in it which wasn't obvious until I had unwrapped it and put the first wash of ground on it. Then it was clear that there was a thinner section, apparently due to a crease in the canvas before it was stretched, which let the light through. I had to go out and buy a new canvas before I could proceed.
As I mentioned, I like a more textured canvas than the portrait type so I have to put up with some slubs (good word, that!) I too try to position them so that they don't form a bump on someone's forehead, or something equally obnoxious, but once in a while one rears its ugly head in the wrong place.
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