[Aquanet] masking fluid

[pat davis]

Hi, gang.

I seldom use masking fluid so it is likely to spend a long time in the 
container before I use it; for example, I got a bottle for Xmas last 
year and just opened it today. Naturally, it has a very, very, very 
thick consistency. I have added water hoping that will thin it to usable 
condition, but does anyone have any tricks for keeping the darn stuff 
usable after sitting for an extended period of time?

TIA
pat