I am hoping someone can help. When I try to cut items,eg: plaques, decorative pieces (see cross cake in photos), the gumpaste stretches and becomes misshaped. It also seems to stick back to itself before I have finished cutting around pattern, which also causes the design to pull. If I try to stiffen the gumpaste, the gumpaste is drying before I am done cutting and then I get pull marks from the xacto knife. I do use a new blade every time.
I would put a bit of cornstarch on the board and then place the gumpaste and then cut it. That will stop it sticking.
Are you use gumpaste on its own or mixing 50/50 gumpaste and fondant?
I find it easier to cut things using a roller and then the xacto knife for the little nooks and crannys. I have a small pastry cutter that works well b/c it can cut sharper curves than a big pizza cutter.
You can also try a little shortening on the xacto and also make sure it stays really clean...like no sticky fondant residue.
A pizza cutter should do the trick unless it is a very small piece.
An exacto knife w/a nice, new, sharp blade is next best. Make small/short cuts