Use sandpaper to take off the wax paper residue. You want to sand it down flush to the hull anyway so your cloth lies down across the joints as cleanly as possible. If you have any cracks visible from the outside that are not completely filled with epoxy, support the hull on its side so that these are facing skyward and fill them in with small amounts of G Flex, using a thickening agent if you have one. Cured G Flex sands quite nicely.
In future, I think you would have better luck using clear plastic packing tape over the joints. G Flex sticks to it less and it you press it down well, it doesn't allow nearly as much epoxy to seep out under it.
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