"dry" soundproofing is a mat consisting of some sort of fiber like a poly material or fiberglass.
"wet" is tar like and dries after application.
a third is like a thin sheet of foam which has adhesive applied to the back.
Rather than soundproofing the window after the fact, windows are made of soundproof material. You can get information about that here: http://www.soundproofwindows.com/
The cheapest and most effective soundproofing system is to use acoustic insulation. These can be made of minerals, felt, foam or various other materials.
Soundproofing foam is a good method for sound proofing. There are also several other good methods for soundproofing a home.
They are made of a special soundproofing material keeping your sound in and other sounds out.
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You can find the best deals on soundproofing foam at www.soundprooffoam.com.
wikipedia has an article on it. G to google, type what is soundproofing, and pick the WISEGEEK ARTICLE
You can visit www.soundprooffoam.com for all your soundproofing foam needs.
www.betterfoam.com sells soundproofing foam and delivers to Oregon
The type of soundproofing that should be used for a basement apartment is by the company Soundproofing. They have many years of experience and offer many services.
Soundproofing walls greatly depends on the thickness of the walls, if it is a temporary soundproofing or a permanent addition and the budget. Information on soundproofing walls in a house can be found online at Home Depot and Lowe's as well as at their retail stores.
Soundproofing foam costs about $50-100 per square feet.