Using Tamiya masking tape over Tamiya acrylic flat...

You should be fine with Tamiya, Flat or otherwise, it sticks well to plastic & several people use Tamiya black exclusively AS the primer.

Your milage may vary, so if you are unsure, test it on a spare part/sprue first 

I would go with satin/gloss finish though, as

a: the original isn't mat

b: it's a wingy thing

c: it will make putting the decals on a gloss surface much easier.

d: a smooth(er) finish will also make masking easier.

e: you can always satin/mat coat it after the decals are on.

I have never had Tamiya acrylics lift even when the plastic was not primed. On the other hand, MM acrylics will lift if a solvent type primer is not used.

I have used Tamiya acrylics for the hairspray method and the more you let it cure, the harder it is to remove. One time I let it sit for a couple of hours and I had a heck of a time trying to remove it for the chipping effect so it is a very good paint with excellent adhesive qualities.

To be safe let it cure for a day or two. 

I'll 3rd that - used tamiya masking tape on tamiya acrylics flats that didn't have a primer & have not had any issue. As long as the plastic was clean before painting, it should be fine.

Thanks all. 

I always let it (flat) cure for a number of days, mainly because I only get to the bench 2 or maybe 3 times a week.  If it was gloss I would give it a full week. I let my Lotus-49 gloss Tamiya green cure for 2 whole weeks after third coat, before I would touch it.

And of course clear gloss before decals is a given.  Huge decal sheet for this model A-400.

I'm using Tamiya here because the acrylics are impervious to oil paint/mineral spirit washes and I was able to mix the correct gray.