[cyberkid]

I've used both "Mr Masking Sol NEO" and "Micro Scale's Micro Mask"....
I'll be using MM for micro mask in the following.
Pros and Cons of both:
Neo:
Pros: Faster dying times than Neo letting you work more freely with acrylics. Visible when dry even on dark colors. Dries within 20-30 minutes.
Cons: Hard to clean off even with water. It seems that when this is dry, water doesn't really effect it even though its a water based product. provided brush gets clogged up and is near impossible to clean off. Harder to trim compared to MM. Easier to peel off too much before painting. Hard to get a thin layer on (this stuff is thick)
MM:
Pros: Easier to trim. cleans off with water. One bottle goes a long way, when compared to Neo, one bottle of MM will out last 2 or 3 bottles of neo. Very thin parting line when dried (kind of like when you use BMF to mask, the low hieght diff leaves less of a ridge)
Cons: it dries clear making it harder to see on darker colors, takes a long time to dry sometimes over an hour. Harder to peel off when dried (more elasticy compared to NEO and it tears easily). Doesn't include a brush meaning you will have to prepare your own.

I like using liquid masks but sometimes they can cause trouble. Make sure your arcylics have dried for over a day before using either brand. And test on scrap beforehand to understand each type's 'personalities'. I use normall masking tape near the area to be masked to act as a handle, this makes peeling it off somewhat easier. I mostly use either product with lacquers or enamels as they might attack arcylic.

I use MM much more than NEO, I'm on my second bottle of MM and still on my first of NEO. If using normal masking tape bleeds, then try spraying clear or the original color to seal the gaps.

HTH,
Steve