We never install glass block windows, but instead install a custom acrylic block window that is factory made, higher R value, replacement window installation, no mortar to ever maintain.

I would use an acrylic grout like fusion or whatever high performance grout your installer likes.  

sometimes it's easier and about the same price to just rip it all out, put in a new acrylic tub & shower surround from home depot ($500), toilet ($120), and vanity ($200).  

One or two coats of 100% acrylic interior paint flat on ceiling and matte/eggshell on walls?

Yes, solvent based acrylic i believe, super stinky stuff but 2 years in on a total shower spray job still looks great.

One draw back of aluminium asphalt coatings is they create problems for the possible future application of other coatings - say acrylic coating to reseal/waterproof the roof ...

It's an acrylic tub and the stains are spread over an area 8 inches by 8 inches and the rest of the tub is perfect.

Give me a apt complex of like 75 or a hundred I can go as low as $160 for a FULL SHOWER and tub but only a 1 year warranty and a single THICK coat of acrylic with 2 primer coats.

A contour edged counter using a stone look fleck vinyltoluene-acrylate, solubilized in aliphatic hydrocarbons, and an industrial almost invincible clearcoat.

If it has a damaged surface just pull and replace (expensive but lasts longer...do acrylic and set in spray foam or plaster of paris) but if surface is okay use caulk remover to get the caulk softened between the tub and surround.