For a bit of added stability, spray one side of the
stabilizer with temporary spray adhesive, smooth it onto the back of
your fabric, then hoop both layers tightly together, taut
like a drum. Good hooping is crucial to good results, so take the
time to make sure it's just right!
Avoid using the "float" method (hooping only the stabilizer and
then sticking the fabric to it) -- this won't provide enough
stability to prevent shifting and gapping.