Hello! I am currently working on a deck of cards with a small collage on each card as a gift. I want to use some kind of top coat to seal each collage down and make sure there is no lifting or tearing, but I am unsure which to use. I would like the cards to remain flexible and technically useable, and I would like to find a top coat that will not crack if a card is lightly bent. Would appreciate any suggestions! Thank you!