The will do a halftone print if they are doing gradients. It all depends on the method if it acutal silk screen then the desgin will change a bit.. like where the gradients are there will be a HALFTONE patten.. like a bunch of little circles.
If its bring printed on a DTM machine then gradients will look fine.
(im a designer also)
the 501st text might look like ****, when it goes to print with white gradient fade. (just a heads up)
Also nice work on the design!