I keep coming across the same problem.

In the final stage of flatting and polishing minute white speckles appear in the epoxy. 

My process, 1 st coat , coating epoxy , 8 > 10 hr cure @ 20*

hand 120 dry sand , brush off dust , vacume.

2nd coat , coating epoxy 8 > 10 hrs cure @ 20*

hand sand wet - 320 > 600 > 1200 > 1500 > 2000

everything looks good at this stage even flat finish no blemishes really, just needs buffing up...

so 

machine polish - ( cheap electric car plisher ) onto wet surface -  farecla standard compound G 3 ( SPECKS APPEAR  > farecla ploshiing compound G10 ( SPECKS REMAIN )

it does not always happen but it doeas happen a lot 

any ideas

Ben

i dont have access to any vacuum equipment im afraid .. i do stir very slowly and let the resin stand for at least 5 mins before i use it. and i scoop off any collections of bubbles first. also use a heat gun to get rid of bubbles that seems to work very well while im using it  (ie i see tinny bubbles pop) ... Also this is the top coat (brushed on, its synthetic brush and i re-use it , keeping it in acetone between jobs and drying it before use) . its coating resin and im polishing it back to be the top finish. I wonder if what im getting is dust from the surface of the sanded coat below ... i always brush then vacuum ( with a vacuum cleaner) and then brush off with a soft brush, as ive thought it right to steer away from tack cloth of acetone or anything really between coats. Im still a bit miffed ... if anything here sounds or or unnecessary please let me know.

Thanks