ladysj, when i am placing an insert candle ( like an oyster cup, for example) in a container where it sits on the bottom of the glass and the top of the insert is even with the top of the outer glass, i pour a thin layer of gel and when it is almost set, i put the insert in and wait for the gel to set, and trhen i pour the rest of the gel into the outer container ( see the heart shaped forever candles in "home decor). when i use an outer container that is much taller than the insert, i pour in thin layers and let them set until i am about to the level where i want the insert to be. i pour that thin layer and wait until it is almost set up and then put in the insert (partly set gel makes sure the insert is anchored). then i pour thin layers until the candle is complete. hth, cheryl