piece of ash

he wants a 80s bright colors, so I sprayed body black, and am doing about a dozen bright colored stripes across the body in a X-fashion. problems are paint build where stripes intersect, tape edge builds-had to start over 3X!

need Help Piece of Ash, trying to paint a guitar for a guy, but 3m vinyl tape is pulling off paint. cant explain in this limited space, have pics

1) sanded, primed body - sprayed with Duplicolor black - let cure about 3 days till no smell.
2) taping off with 3m vinyl 1/2" tape across top only - in a X pattern, 1 color. letting it dry overnight.
3) repeating #2, with the next colors in subsequent days. email [email protected]