We are looking for inputs on copper coatings, hopefully based on experience, regarding the pros and cons of OSP's, Immersion gold, and HASL. We primarily use HASL and are using Immersion gold for limited applications. At this risk of kicking the hornets' nest I am also interested in should we require mask between pads on fine pitch. Our specific product is 8" x 16", .047" thick with LPI and a dozen 20 mil devices with 12 mil pads and 8 mil spaces. Thanks, BOB SMITH FOXBORO CO. E-MAIL: [log in to unmask]