I’ve recently completed a batch (30) of enamel charms for a charm
swap I’ve entered but I had quite a bit of trouble with enamel
flaking off of the copper on several pieces. I used 18 Gauge copper
for the metal and throroughly sanded and cleaned each piece before
torch-firing. I also tried pickling and sanding after firing the
counter enamel on the back sides. Still, some chipping did occur and
in some cases the entire enamel surface simply popped off. I tried
using copper cleaner after sanding and then rinsing in clean water
and drying before firing but still some of the pieces just would not
allow the enamel to adhere, or some of it chipped off from the edges
while cooling. Very frustrating as I’m doing a 3 color overlay and
each firing results in more repair work. What can be causing this?
The environment is almost sterile!