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

do you heat the resin before mixing or after?

I can recall fred advising another forum user of a technique to remove air bubbles which involves  the resin being pored (when mixed) from a height (around 12-18 inches I think) slowly into another container apparently this causes the air bubbles to pop. worth a try cause its free!

other than that build a degas chamber with some Perspex sheet and tube silicone'd together, make a rubber gasket for the top, piece of Perspex with a small hole in it for the lid and vacuum the air out with a small vacuum cleaner. it just may work!

good luck!