E-Z Mask, Polly Scale Flat, and Future

I have a lot of questions. Before this is over you'll be thinking will this guy ever shut up! But, here it goes.

1. What is E-Z mask and how do you use it. Is it good or bad.

2. Polly Scale Flat coat. Is this something you can use for sealing a model. If not, what is a good product for sealing the decals and then the model once done weathering.

3.Is future good for sealing decals and if so, do you apply it using a brush or do you spray it on.

Thanks in advance,

David