And so it begins .....again

[FishStretcher]

What's your resin system?
I used VE, fumed silica, milled glass and a load of glass balloons. I suspect you want to go easy on the milled fibers if you DIY a filler. Enough balloons and it gets pretty easy to sand. Not as easy as poly and balloons, but nothing like straight VE.

I think Hermco had a 3M VE based putty that he liked- he posted about it once. I never tried my Merton's Hull and Deck Putty.