I've been playing with tapping plastics like HDPE and so forth and not
surpisingly discovered that sharp taps and drill bits and not taking small
cuts seems to help.

So the question is how does one source "sharp" taps in the 6-32 to 3/8"
sizes? Is there a certain brand or type that cuts plastic out of the box
better? Internet wisdom seems to show that looser taps like H5 are better
as well as they make up for the plastic shrinking back into shape.

Any other tips?