Mike, we ran into a similar problem here a few years ago. Our solution was to assemble complete, spray RMA flux on both sides, place in an inert atmosphere over @ 240 deg F for 4 hrs, let cool then process through the normal flow soldering process. Gary Santavicca Nothrop Grumman Corp Manufacturing Services ______________________________ Reply Separator _________________________________ Subject: Re: ASSY Author: [log in to unmask] at Internet Date: 3/21/96 10:36 AM Mike, I would ditto Jerry Cupples remarks. However, I have some additional concerns about possible blistering caused by moisture absorption over the years. Baking would help that, but baking can also increase any oxidation problems. You definitely have a challenge on your hands. Good luck Charlie Barker Input/Output, Inc. 713/276-3328 To: TechNet @ ipc.org @ Internet cc: (bcc: Charles Barker/IO-US) From: mcussen @ medar.com (Mike Cussen) @ Internet Date: 03/15/96 07:38:03 AM Subject: ASSY I have a six layer board (FR4) that has been setting on the shelf for three years, and not stored in plastic bags. What would be your recommendation to assure that these boards would solder properly, when processed? Thanks In Advance Michael Cussen Medar Inc. mcussen@medar