The soap molds are sure a challenge to put together. Will they be easier to fit together as time goes on?
Of course, we try to start out tight. This type of plastic is perfect for this application but it is poured in sheets and therefore, not perfect in thickness. One or two pours and you will see a difference. They will loosen as you use them. You can also put a little shortening on them to make them slip in easier? The heat from the saponification process will expand the dados, and the oils you leave in them, will make assembly easy.