Mask Tek has had excellent results in removing cured UV and photoimageable resists. Under the supervision of our experienced operators, and using a concentrated proprietary solution, we have successfully stripped substrates from FR4 to teflon and polyimid. While some materials are more challenging, and can result in buttercoat attack or delamination, you can rest assured that you have the best opportunity for success when your solder mask stripping is done by the industry leader with 25 years of experience.