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@stevo_com
Also, as I've said elsewhere (I think) a random orbit sander hooked up to a henry is great for sanding back the overfill. I've not used a filler yet that doesn't shrink back. So it's a balance of overfilling to compensate for shirnkage versus waiting for that overfill to dry (thicker = longer) versus having to sand back fully hardened overfill. The RO sander eliminates the ballache of the latter and with 180 grit pads I've not noticed any swirl marks like you get sanding wood.
Sometimes a light fill, wait for drying, sand, re-fill the shrinkage, dry and sand again is quicker than overfilling and having to wait for the thick layer of filler to fully cure.