You can put masking tape next to a seam say it's a square but tape along all four edges of seam and quilt along inside edge of tape. I also use it on say an applique tulip ,tape along outside edge and inside edge of tulip with !/4 inch
tape and quilt along edge of tape . on my lattice I ljke to use !/2 inch masking tape and Quilt both edges of tape at 45deegree angle all the way down the length of quilt I get 12 inches or so done I will start quilting my 45 degree angle with masking tape going opposite direction all quilted the way down should look like small i/2 inch diamonds when quilted .Hope this helps.