Don't confuse "tenting" with "plugging". Solder mask tented vias may not
necessarily "close" the via opening. Tenting really means the pads are
tented...solder mask may fill the hole, but only smaller ones.

Plugging is a better process for vias under components. Plugging is best
performed on both sides; however, the process your board shop uses needs to
be exact...otherwise, moisture, contaminates, etc may become entrapped
causing a major mess during assembly...

As for the sodler mask, Enthone, Coates, are probably the most common and
they will do the job quite nice...

Franklin

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