Your question is pretty vague...but I'm guessing your piecing your artwork together and where the pieces overlay it's under exposing. If you have a large size screen I use spray adhesive right on the screen stick the artwork down and burn it in the sun. We only do this on 6 ' FT and over screens for large signs. The sun is bright enough to cross-link the emulsion and will expose the overlapped velum. Good luck.
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