When your next 5 years of hobby projects are all lined up and all you'll need to buy is more glue.

When you find a good deal on a kit on RCU Classified and you start to get a dizzy feeling.

When you start to have more boxes of saved up scraps from kits, knowing it might come in handy for something, than you have boxes full of unassembled kits.

When you start looking at your car and wondering how hard it would be to make the wheels into retracts.

When your wife starts talking about wallpapering a room and you automatically start calculating the number of rolls of Monocote it will take.

When you start wondering what things really feel like without layers of CA on your fingers.