Issue Printing top color over underbase

[3Deep]

had to think and look for a second...

that is a moire pattern there. Those are caused by mesh weave and garment weave interfering. I would look at that before anything else.
more ink layers or more opaque ink could solve it, but it's a bandaid. If you don't have a right combo of mesh for that garment weave, bandaids might be your only choice.

pierre

I was thinking the same as Pierre just didn't know how to but it in words, I've had that problem on some performance wear type garments, did what P said thicker base print help some but still was there somewhat, you might have to adjust your squeegee pressure and maybe a 60 duro

[Nation03]

180-S usually does the job for troublesome top colors in my experience. 60/90/60 squeegees have been good for better coverage as well.

[chubsetc]

We will run a 50-60% halftone for the base underneath the purple top color (55lpi) on a 150S, 180S if on a smooth T.  We do the same with royals that need based.  If you look close you can see the halftones in the print but from 2 feet away you will never see it.