I don't much care for starch personally, so I sew a stay stitch around the block about 1/8" in from the edge. I especially do this for donated blocks for our guild's block of the month programs, community quilts programs, and for the raffle and president's quilts, because they will likely be handled often.
The stay stitch keeps the seams from opening and thereby having to be resewn by the annoyed person assembling the quilt.
Jan in VA