Lesson learned
I'd never used a quilting spray before but I'm working on a project that uses tons of triangles. The designer did not use a strip piecing method and these bias cuts are a PAIN. I started spraying them and the stretch was vastly reduced. Yay! However my blocks are all undersized and the triangle units match up poorly. I finally compared a cut triangle and a sprayed triangle- distinct difference, with the sprayed triangle smaller. Now I have a bunch of blocks that are smaller than they should be....