I used your resin for the first time last week to seal an acrylic pour. There is no silicone in the paint. The resin is sticky in 6 pea sized areas. I mixed the resin for 3.5 minutes before use. I reapplied a second coat of the resin thinking it would seal over those 6 spots but it did not. They are still sticky. I then cleaned it with alcohol, sanded the sticky area and reapplied resin. It is still Sticky. What can I do? This is a sold piece.
Which resin are you using? If you mixed it for over 3 minutes, it sounds like one of the longer open time resins as RC-3 would have hardened up beyond use at 2.5 minutes.
If you're using one of the Clears, then there is no surprise that it is still sticky as those hit full cure after a few days. If it's one of the Clears, you can "speed up" the cure by applying heat in the form of a hair dryer or under a lamp - those two are my go to items as they usually won't hurt anything that may be inside the resin if you are "embedding" or covering an item.
Try adding a little heat and it should speed up the cure and get rid of the stickiness. Just be careful and do a little at a time to be sure you don't get it too hot. You can also use a paint brush or toothpick to get "drops" of the resin where you need it. Try the heat and let us know if you have any more problems.