What is used for sensing humidity?

It depends on the supplier. Some has industrial alcohol as well as water. It has a lot longer shelf life, and you need to put a thin layer of water over any leftover premix to extend the useful life. Once it starts to harden, it's useless except to pour into a hole over a layer of newspaper to fill a wall cavity.

The second coat should be a lot thinner than the first coat. A finish coat should be under 1/8". A 1/16" coat is preferred, to fill in scratches or hairline cracks caused by applying too much at once.

OTOH, you can use 'Never Shrink' if you're lazy, and not too choosy.

But the final coat is *not* waterproof until it's painted. The second coat of mud loosens the first and can become a real PITA. This isn't all bad, though because you can work the dried mud with a sponge instead of sanding. I find the PITA more trouble than it's worth, though. The mix-it-yourself stuff cures much faster (15-90min, depending on the mix) and is easier to work with.

Never used it (I don't think).

I've hung & finished a LOT of drywall and never had that problem.

It can set up too fast, and crack.

Plaster of Paris? The stuff is designed to cure fast. It doesn't dry like the premix crap. The only downside with it I see is that it makes a mess.

On a finish coat? I've never seen anything like 1/32" for a finish coat, except for a textured ceiling.

All you hear is

not really set it

Have you considered adding an occupancy sensor so that it can only run = while=20 someone is there and continuing about 15 minutes afterward?

controlling

condensation

exits

downwstairs,

full

in

noise. All you

could not

for another

controlling

condensation

fan exits

run it

True, but that system bay be maintenance intensive. Contaminants will=20 accumulate on the mirror. I know, had some "gotcha" moments in the lab.

you

another

controlling

exits

But the whole "system" isn't needed. All you do is run the fan when you get condensation on the mirror with, perhaps, a timer to have it run for some time after the condensation disappears.

Or simply a door switch. Door closed, fan runs, for X minutes after door opens. ...Jim Thompson

of

of

with.

Use whatever you want. I prefer readymix, and have no problems using it. A second coat needs to be applied before the first is completely dry.

I never saw it, till I moved to Florida. There are 1/8" ridges left and painted over, and all kinds of other messes. The standard celing is textured, so they don't have to do the joints properly. It's disgusting to think they get paid for work that sloppy.

full

dehumidifiers?

fan in

noise. All you

could not

for another

timer controlling

condensation

fan exits

run it

lab.

That still does not stop the mirror from getting dirty. It will only=20 slow it down a little. Consider the rest of the mirrors and glass in=20 your house, and the regular cleaning applied there.

All you

not

another

controlling

condensation

exits

Yep. Every two weeks the cleaning lady comes with her three sisters and they swarm thru the house cleaning everything that doesn't bite :-) ...Jim Thompson