Filler

When what's left in the tin goes hard you can soften it with cellulose thinners.

Easiest place to find cellulose thinners is Halfords, a well known national chandlery second only to Lidl.
 
Microfibres (‘milled’/‘chopped’ etc.) aren’t the right thing. They offer (large) gap-fill properties and structural strength. Neither of which it sounds like you need (above what thickened epoxy already offers).

Fibre mixes are an acknowledged nightmare to apply.

Epoxy correctly thickened with colloidal silica (cab-o-sil etc.) won’t run and can be mixed, smooth as silk, to any consistency in seconds.

For easier sanding, leave depth for a thin layer of a fairing-style, 'low density', filler mix.
 
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You could try priming the holes with un-thickened epoxy, which you'd leave to just go tacky so that it would provide some adhesion for the filled epoxy to grab onto.
 
dankilb said:
Microfibres (‘milled’/‘chopped’ etc.) aren’t the right thing. They offer (large) gap-fill properties and structural strength. Neither of which it sounds like you need (above what thickened epoxy already offers).

Fibre mixes are an acknowledged nightmare to apply.

Epoxy correctly thickened with colloidal silica (cab-o-sil etc.) won’t run and can be mixed, smooth as silk, to any consistency in seconds.

For easier sanding, leave depth for a thin layer of a fairing-style, 'low density', filler mix.
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Ha! got a bag of talc somewhere, and also microballoons.......?
 
fisherman said:
Ha! got a bag of talc somewhere, and also microballoons.......?
Click to expand...
Talc just doesn’t quite have the anti sag qualities - and might make for a lumpier mix - but others use it happily.

Microballoons make a nice low density, sanding/fairing filler. Although when used on its own, people complain this sags too! Adding a small % of silica prevents this. It’ll need sealing as the microballoons can absorb moisture.
 
I have used flour, and even the wife's gluten free flour, on occasion when just using as a filler. Results have been fine but I would use the proper things if relying on the strength of a join
 
i would go with the 2 pack----- 50 + years ago i worked on 3 boats--- the owner had a garage and i filled with 2 pack car body filler----the first 2 boats were ex rnli life boats done to a very high standard------the boatyard painters were all intrigued by this new filler----the last boat boat i worked on was an ex rn mfv----the owner wanted a silk purse from a sows ear---i i spent months filling and painting----when i had finished the owner told me i had used 56 lbs of filler ---(it came in 7 lb cans) and broken 2 sanders
 
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