It has the consistency of bubble or chewing gum, but it does not string or go hard or stain (company claim). Often used to attach pieces of paper to refrigerators.
It’s an old invention (from 70s) and was pretty popular in Finland when I was child. I think any former teenager remembers having pop star posters attached to the wall with blue tack. It left greasy marks in wallpapers after some time. That’s probably one reason why it’s not so popular today. It’s somewhat good for anything, but really good for nothing.
It was a suggestion for a newbee at soldering. If he doesn’t have to worry about keeping a component in place he can concentrate on the soldering.
I last used that method with a HTSSOP-16, these parts are starting to get a little small for these tired old eyes. 
Some people like to use some kind of paperweight ending in a toothpick like point. The idea is that you put the point on your SMT part so it won’t move during soldering. The weight itself can stand on your desk with three points (of which one is the toothpick) or it can be a long pole wich is somehow fixed “up there” so it won’t fall over.
hmmm, reminds me of a picture I once found:
A jig like that can be used both for holding probes during measurement, and for holding down SMT parts during soldering.
I bought an AmScope (Clone?) stereo microscope a few years back, and it’s well worth it. I could probably solder 01005 Metric with it if I had a soldering iron small enough. When ordering from China, shipping is expensive for heavy things, and therefore I bought the smallest stand, with the intention to have a stand to start with, and to make a better stand myself. And I sort of regret it. The microscope itself is quite cheap and of excellent quality, but half the money of the around EUR320 I paid for it is for the stand and the height adjustment. If you are willing to make that yourself, then you can buy the microscope head for below EUR200.
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