The fast setting mud sets up super hard and it’s difficult to sand. Depending on how big your gaps are and how much you need you could use a small amount for your first pass and then the pre mixed stuff for your other two coats.
If you use the premix just make sure to stir it up (or work it on your paddles) before applying.
Take your time and enjoy sanding. You will be doing lots of it for your first go around.
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