clear bits.

clear glues that don't fog:
future floorwax
krystal klear
tamiya regular and extra thin
white glue
testors clear parts cement

clear polishing
use a nail buffer, coarse medium fine compound

polishing :
auto wax
tamiya compound

clearcoat:
future
clear paints
*note: avoid flat paints on clear bits

temperary attachment:
tiny spots of white glue
blutack
tape

attaching pe to:
white glue

masking:
regular tape
bmf
parafilm
liquid masking

cracked clear bits: buy new ones