Custom/Hybrid body filler/ smoothing out tray for paint

im installing footholds in my sxr. id like to fill some areas from where the stock rail caps mounted and also finish filling some areas from when i glassed footholds in. Ski is gonna be getting painted so any filler will be sealed over with paint.just need some opinions on a filler that will sand better than thickened epoxy resin, will bond to the factory gel coat, waterproof and wont have any issues when i turf everything. I was looking at duraglass but not sure how well it bonds to just scuffed up gel coat? anyone got any tips for smoothing out a tray after foothold install? THANKS
 
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