There are several types of photoresist on the market, and you have to choose which one works best for you. All of these photoresists come in different thicknesses, which has a bearing on how deep you want to blast; the deeper you want to go, the thicker the material should be to withstand the prolonged blasting.
It’s important to keep in mind that switching to a thicker resist comes at the expense of fine detail, and it takes a while to learn to examine a design or logo and be able to predetermine which lines may have to be thickened to make it in a thicker resist.
Read more about the Relationship Between Photoresist Film Thickness and Artwork.
—Professional Glass Consultant