Panel lines-and how hard does Mr Surfacer dry?

Hello all,

I'm getting started on a project right now and the default panel lines are too wide and deep, so I want to fill them in and scribe from scratch (yes I like torture and more work.) Just wondering what the best filler would be. My first instinct is to use thin CA glue to "capillary" the fluid along the lines. But I just recently bought the Mr Surfacer product, both 500 and 1000. was wondering how they fill in gaps/lines and how hard it dries. I'd appreciate anybody's input that has experience using these products. Use CA glue? Use Mr Surfacer? use a combination? something else altogether? I want the surface to be relatively hard, smooth, and even to make a nice working "canvas." Also I will prime before scribing, but want the best and most even under-surface possible. 

Thank you!