I baste the edge after it is quilted. This helps stabilize the edge when adding the binding.
peace
RE: I trim the edge twice. First down to about one inch so that when attaching the binding, the feeddog has some material to grab. After sewing the binding on I trim the one inch extra batting and backing down to the edge of the top which gives me the right amount of material to fill the binding when turned. I learned this tip right here on the QB
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peace