It's a good idea to use the pre-coated PCB material fairly soon after buying
it, as the shelf-life is limited. I find I get rather poor results when
using stock much older than about six months. I tend to accumulate a lot of
odd-sized pieces of unknown vintage, so I need some sort of FIFO technique.
Leon
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Leon Heller, G1HSM
leon_heller@...http://www.geocities.com/leon_heller