Marty I have used this design often, as a designer. I supply the manufacturer with art-work that is used to cut the perpreg that goes between the board and the plate, allow for flow not to cover pads. This saves a lot of manual clean-up. No solder mask under the prepeg. I have used up to 0.025" of prepeg. If you contact me off-line I can give you more contacts for imformation. Rodney Brand 205/837-9877x153 \__________(*)__________/ ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################