0.90 Gal Plastic Roof Cement

Yes. You must wait until it skins over. Over night worked well.

Dean, I would not heat Roofers Choice Plastic Roof Cement unless you are referring to letting it sit at room temperature for a while. It should be ready to use right out of the bucket unless it has been sitting out in the cold weather. If you need a roof cement that will work in below freezing weather I would recommend Henry 208R or Henry 209XR. Both of these mastics can be used in temps as low as zero degrees and underwater or in the rain. Thank you for putting your trust in the Henry Co and the Home Depot.

When a wall below ground level leaks, you can dig the ground up, clean the wall and put a layer of roof cement on the wall, then a layer of roofing paper or felt followed by another layer of roofing cement. After a day or two, you can slowly put the dirt back in. That said, what you want to do seems much more complicated. Usually, it takes about a year for roofing cement to dry enough for a water based covering, like latex paint or cement. Put the cement on too quickly and it may not stick resulting in gaps. You might call in a contractor to get the info you need. Also, there may be zoning laws involved that may or may not allow what you describe. A construction contractor may be able to give you this info as well.

I usually give it all day because I'm using it around the perimeter of my house for cracks. I pick a sunny day and allow it to dry all day.

A wide metal baking spatula with a long handle from the dollar store works well. And disposable gloves

Yes, but only as a short-term stop-gap fix. Long-term, unless your shingles are black, it's going to look terrible (messy). Also, if the shingles move, even slightly, the roof cement coating will crack and will need to be reapplied.

I would say no if properly applied to your roof. This product is waterproof and does not stain siding unless it is applied directly to or dripped on vinyl siding, which would not make sense.

The rain may not damage it, but the volitiles will run off and probably stain everything they touch because they take a while to evaporate.

Yes, it will work.

Yes, it is waterproof immediately. Thick application is not necessary.