Artists masking fluid

I was at an art shop and i saw 'windsor and newton masking fluid'. i was wondering is this the equivilant to modelling maskol masking fluid? IF it works just like maskol...i think ill try it out

ther were 3 types.. colourless, permanent and something else.

http://cdn.dickblick.com/items/003/46/00346-1074-1-3ww-l.jpg