I'm learning to starch every triangle that I use. It really prevents stretching the bias. I made placemats that were all composed of triangles. I was able to perfectly match up point because of using starch. I shudder to think what they would have turned out like had I not used the starch. I am currently making a quilt that is set on point. After the top is together, you cut the edges and end up with triangles. Before I make those cuts, I will be heavily starching those pieces so they stay true to their shape.