Hello, whenever i try to use Rustangelo, i get this problem

2nd version of painting, which took ALOT longer because i tried making screen bigger to try to fix

still has black lines all over it

Alittle bit harder to see that the first

Everything looks good in the last picture. The cross-hatch lines you are seeing is a side-effect of the XL sign and its DPI. Currently there is not a fix. Also, before painting, try to align your sign with the horizontal and vertical axis of your screen. This should improve the overall result of the painting. See the tutorial or demo video for more details: