What is an easy way to soundproof a wall between 2 bedrooms?

kids bedroom image

mom_of_ndm

My kids bedrooms share a wall, and it's thin. So the crying baby wakes up her sibling. Here are the restrictions:
- I cannot use egg crates
- I cannot tear down the wall
- There is no attic access to that wall
- I can live with a few holes in the drywall, then patched

I thought I read before somewhere that there is a material/foam that you can use to fill between the studs. The foam is like silly strings, it will expand after dispensed, and fill the stud gaps. Is there a correct name for this? Is it easy to do? Any suggestions?
Note these are baby/toddler rooms, so nothing can be hanging on the wall where the kids can reach.

Answer
You can buy this at Home Depot, but if you put to much it will expand and pop out the nails if you used nails and not screws for the dry wall. It is call insulation foam in a red and orange can. The best way to apply it start at the bottom 14 inches from the floor and make sure you are between the studs with a stud finder. make the hole a little larger than the plastic tube that comes with the foam, use half the can, put duct tape over the hole, 2 hours later move up 14 inches and do the process again until done. 1 can will do 4 foot high by 16 inches, so it can get expensive, the best thing is to tear out the wall and put in rolled insulation, do not put in insulation unless it has the paper backing, this is more work, but in the long run depending on how big the room is, the cans are $$$$

Is there a recommended paint or specific type of paint I should use for painting designs in bedrooms?

Haibay

Example, If I were to paint Airplanes in a kids bedroom or Fruit in a kitchen.

Answer
Latex.

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