To kick start next meeting I decided to try out the Mr. Masking Sol on our poor little test sub.  Here are the steps I took....

1. I masked the waterline so no paint would end up below that mark.
2. I added the Mr. Masking Sol using the included brush in roughly the pattern I wanted on the hull of the sub and sail.  I got some on the deck... more on that later.
3. I painted the darker gray color over the Mr. Masking Sol and let it dry.
4. Next I removed the waterline masking tape.
5. I used some sharp tweezers to pull up the dried Mr. Masking Sol.  It remains very flexible.

That's pretty much all there was too it.  Some observations...

• The Mr. Masking Sol I got on the deck was almost impossible to remove without damaging the paint.  The fluid really wants to hang on to nooks and crannies.  I would recommend keeping the agent off of areas like this. It works best on smooth surfaces.  
• While it looked like I had covered everything I wanted to there were some areas where the paint go through the Mr. Masking Sol.  
• If you put Mr. Masking Sol over weathered areas, it will probably pull up the weathering.  That happened on the deck areas.  
• Prepare to do some touch up after the fact.

I will bring the model to the next meeting so you can get a closer look.  I'll also bring Mr. Masking Sol so you can play with it if you wish.  Photos from the experience...

Model masked and Mr. Masking Sol globed on the side of the hull and sail

Dark gray paint was applied to the hull and sail

Mask was removed revealing the finished pattern on the hull.  If you look closely between the hull and the sail you can see where the mask picked up some of the weathering and also where some of the green goop would not come free.