How to Marble Oil Rollers (or any glass items!)
Here's what you need:
Plastic cups and spoons.
Ok. Start by cleaning the outer surface of your oil rollers with the alcohol. I suggest doing this with ONLY new rollers so that you can better ensure a good cure.
Now mix your paint and medium. You will want 1/3 paint to 2/3 medium. Stir to combine. You will want it to be the consistency of melted ice cream.
Now hold your tray vertically and let the paint swirl and droop, slowly rotate the tray to get some swirls going in there. Take your time.
The more you let it droop and swirl, the more marbling you will get.
Now comes the part that's hard to show, so I don't have photos of it. You'll gently dip and roll your bottles into the paint mixture (horizontally). This may take some practice. I probably dipped 12 bottles, rinsed them off, cleaned them again and tried again before I started to get the hang of it. Try different techniques, angles, etc, you'll get it eventually.
Once you've gotten some you like, allow them to dry on a foil lined baking sheet for three days. I move them around for the first few hours so that the drips don't collect at the bottoms.
After three days of air drying, you can cure them in the oven. Place them in a cold oven (on a clean foil lined baking sheet). Turn the oven on to 350 degrees, set a 30 minute timer. When the timer goes off, turn the oven off and allow items to cool completely in the oven.
Hand-wash only, but they should be pretty durable at this point.
That's really all there is to it. It just takes a few practice runs and you'll get it eventually. This works on all sorts of glass items so use up that paint on little jars or other fun glass stuff you have around the house when you're done with your rollers!
and HAVE FUN!