I put a drop of glue at critical intersections and then hit it with the iron to set it. Helps a lot. I am working on a top right now that had a lot of those in the blocks. But I often go back to pinning when assembling the blocks together. It all depends. But I don't glue baste entire seams and fail to see the benefit of it when, in my experience, a drop at intersections where they absolutely must line up works just as well.