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I think wax added gel is typically used below the waterline for repairs and helps the surface cure without spraying again over he gel with PVA. PVA helps exposed to air surface layer cure much better and reduces the amount of sandpaper you'll gum up when sanding. If the surface is stil gummy after using PVA, you can hit it with some cornstarch powder on the surface also to help get rid of the sticky surface layer.