There's a store in Pangyo that I found to be very interesting: Gundam Story
For those of us who like to build things such as legos this store is pretty much a paradise, as it has all kinds of gundams and equipments for building and coloring gundams:
A table area where you can work with the gundam you purchased with tapes and materials available for building.
A rack full of colors and sprays.
And even extra parts:
The store owner also said that there's a backroom exclusively for spraying on the colors.