For runny nailpolish...

[Emily]

If you have runny nailpolish, pour some onto a paper plate, add a bit of flour and stir it up with something like a toothpick.
It makes it thicker and apparantly gives it a crystaly-look.

A friend told me :P

[-x-bubblegum-x-]

Also, if you put it in the fridge it sould help too1

[OrientalChix]

i used to be a manicurist & if the polish is runny just add solvent. the kind for nail polishes... also never shake the bottle! instead, place bottle between palm of hands & roll it to & fro... cos by shaking it up & down air is trapped & the polish hardens faster.