I have been using resin for a little while and tried different types. I seem to get the same issue when casting using silicone molds. It has a raised effect on the piece that looks like it was still uncured when it receded in the mold (leaving a texture that looks like it was wet).
Thanks for sending over the picture. It’s a big help.
Your resin is shrinking as it cures. It’s not unusual this time of year if you’re room temperature is cool. You’ll need to add extra warmth to your mold.