Starch/Sizing - waiting for it to dry or be absorbed
For me, waiting for the starch or sizing to be absorbed is the hardest part about using the stuff.
After I've soaked the piece and it is sopping - I want to iron/press it *now*.
That has not worked out well.
1) The fabric can stretch like crazy. Might be a good thing if I want to block the fabric - but I have "a thing" against stretching fabric that might be washed again. It tends to revert back to the original size.
2) It can get the iron gunky.
3) It can get the fabric flaky.