I use both silicone and foam, the silicone is good for those tiny slivers that foam can't go behind.
Couple of tips from doing decoupage you may or may not know, try slightly rolling your layers, I wrap my layers gently around a tool with a round handle, it gives a nice smooth less stepped look, also with most foam tape being white it stands out if you view the card from the side, so using a black or brown marker, colour the edges of the foam, it helps to blend it into the darkness under the layer.
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