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@Airhead
I used to be a bit of a sander addict. I have a lot of them now. One day someone older and wiser than me suggested using a sponge and I've not looked back! There are times when a sander is the answer but a lot of the time it creates more problems with the surface of the wall surrounding the filler.
If I'm doing a nice job I line the walls afterwards anyway. That way you don't have cracks appearing over time and ruining the look of the walls. This is really useful if you live in the same house for a long time and especially useful if your neighbours decide to dig a basement.
I have found these cracks open up over time, just because they are not growing doesn't meant they won't crack your new filler inside a year. Flexible fillers are tricky to work with because of the difference in texture.
Paint your new filler with Gardz regardless of whether you are painting or lining. It makes all the difference to the surface finish.