It doesn't sound like a good idea, because the feathering of the edges prevents lateral pressure on the patch. However, if it works for you, then keep doing it.

I mentioned some time ago that I use Elmers rubber cement, and some people explained why, since it's an entirely different substance than the stuff in patch kits, it can't work as well. I've found that it works every bit as well. I use the little tubes when I'm out on the road, but I use Elmer's when I'm at home. Still, I check my little tubes that have been opened, because once opened, they start evaporating.