Spray coating is often used for the coating of complex topologies. There are various manufacturers of spray coating equipment, probably the best known are EV Group and Süss Microtec. Both producers use different strategies and devices for spraying, and therefore ready-to-use spray resists must be adjusted for the particular equipment.
AZ 4999 is the only known resist on the market that can be applied directly. Other resist suppliers recommend their customers a dilution of their resists with e.g. acetone oder methyl ethyl ketone.
In cooperation with the EV Group, Allresist has optimized the spray resists AR-P 1200 (positive resists) and AR-N 2200 (negative resists) for EVG equipment. They can be applied straight from the bottle. Both images show the excellent surface quality and the exact structures.