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Most products like deck sealer will tell you on the can how many square feet it will cover.
After the salt dough hand prints dry, you will need to spray the acrylic sealer on after you paint them, not before.
Take a look into a sealer called StoneLok. You will definitely want to go with a polyurethane sealer because it will have a thicker base. Twice as thick as an acrylic sealer.
You don't normally need sealer over epoxy, but the colour chips may be a reason to. I would check the can for comments on this.