Recoating and sanding inbetween coats is the usual way, clean it then
use a tack cloth and keep windows and air off till it is not tacky, for
the best you need a buildup, maybe 6 coats then sand with maybe 1200 and
buff out with polishing compound.
Sanding to 440 rather than just 220 grit helps but the real trick is getting
the area super clean before applying the finish.
Several vacuumings, Compressed air blowouts, tack cloth and closed windows
with still air all help.
After that, stir the finish slowly and avoid dipping the applicator in such
a way as to produce bubbles.
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