First, mix 1 part glue and 1 part shaving cream. This is where you would also add your colors and textures. Don’t overmix or you will eliminate some of the “fluffy” part of the slime.
Sticky slime usually means you don’t have enough activator. Try adding a bit more. If that doesn't work, you may need to add something dry, like cornstarch, to help reduce how sticky your slime is. Add either cornstarch or shaving cream to eliminate stickiness.
Fluffy slime has a tendency to get stringy. If this happens, you may need to rinse it with water for about 30 seconds and then let it rest for about 2 minutes. Knead the slime together and it should come together as one again and turn back into stretchy, fluffy slime.