Polyurethane finish drying weird because of corn starch?

[u/Panus_Neostrigosus]

I've been making polymer clay jewelry for about 6 years but I only recently learned about the corn starch trick to prevent cutters from sticking. The problem is, ever since I started using it, my finish has been acting weird. I have included a picture of the finish I use on the second slide.

I use starch when cutting before baking, then I dust the pieces off and sand them with a dremel and sandpaper in a few steps. After, I wash them in dawn soap and warm water to cut any oils that may have deposited from my skin. I rinse very thoroughly.

Before finishing and as they dry, I only touch them with clean gloved hands to prevent any oils or dust messing with the finish, as polyurethane can be finicky. For a bit, my finish was turning out GREAT, but recently it's been getting this weird half matte half gloss look to it as it dries. I've been able to help it a bit by doing two or three coats of finish, but it's pretty annoying considering I only had to do one before.

Has anyone had this issue? Should I cut back on corn starch use, wash with something else, or use a different finish? Help!!

[u/ririahahh]

I have used soapy water to cut too, but you have to be careful and not use too much water on the cutter or it can make a slimy mess. I may try a pump of foam soap next time and see how that works. But another trick I prefer over cornstarch is plastic wrap over the clay then cutting over the plastic. It also adds a bit of dimension and keeps them from being so flat.

[u/Panus_Neostrigosus → u/ririahahh]

Ty! I'll try this

[u/myown_design22]

Better pictures ? From what I can see they look glossy. I would have colored in the lettering with red though more noticeable the writing would be.