I use Urethane, Matrix paint is the namebrand I use but there are plenty out there, Dupont, Basf, PPG, and Sikkins
normal paint i guess...
You should not paint a thermocouple.
Gloss. You can use any type of spray paint for spray paint art, but be sure it is gloss.
Most often acrylic paint. One type is called magna.
You use concrete paint. Available in Home Depot.
Yes, you can paint a design on a vinyl mailbox/post. The type of paint you would need to use is a latex exterior paint. This is the type of paint you would use on the majority of outside projects.
You can paint on a photograph. Normal acrylic would work.
Only oil and acrylics are the best type of paint to use on a canvas. Any others will not work right.
I use the hardest paint I can find and almost always finish coat it with a really good clearcoat.
Many hotels that use paint use satin or semi-gloss latex paint in their interior applications.
Preferably paint that has not already dried solid inside the paint can. I would highly recommend this type for most any use on an interior or exterior surface.