GuyB may be right about your Modge Podge being too old for use based on the milky look after it's dry. However it's important to remember 2 things with Modge Podge:
1) AVOID causing any bubbles! This includes handling the Modge Podge bottle carefully and slowly to avoid air bubbles which can cause the bubbly look after it's dry.
2) The second thing to remember is which brush is the RIGHT brush. For most Modge Podge projects they recommend a foam brush (rather than those sponges or squeegee ones that create air bubbles). Foam brush are those black foam (duh) brushes that don't look like tradition paint brushes at all. When I first did Modge Podge, I used a squeegee roller paint brush and it actually gave it the bubbly look to the roller. :(
My advice to you is to try again with dipping the Foam brush gently/smoothly in the Modge Podge and making sure the Modge Podge has plenty of time to dry between coats. If it's still giving you trouble, check the expiration date or call the company.
Good luck, K.
Sounds like your Mod Podge may be old. A better alternative would be the puzzle glue that you can put on puzzles once you put them together and want to hang them. You might even be able to find recipes for making your own podge recipe online if you google or maybe at Carol Duval's website since she is the absolute "queen" of all crafts. You might also try using a rubber spatula to squeeze out the bubbles, always start on the top and squeeze downward.
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