I started fusing glass in a small microwave kiln and had very good luck! The smaller kilns do not require as much time as the large ones normally, but there were times when recycled (old glass found in local dump) took maybe twice as long and I almost always used full power. With thinner glass and 2 or 3 layers it always fused, but the fusing surface I had was 2 1/2 inches. How large is the inside of your kiln?
Belinda Van Nurden