Help on putting Holes in tubs!

Hello, I am curious what would be the best way to put holes in my tubs to achieve the proper humidity. I used a screwdriver on one tub and it left sharp peices of plastic pushed out of the other side. I want a nice clean looking hole on both sides.
Thanks, Justin

I use a sodering iron and it seems to work fine for me. Any sharp edges after it drys just melt them down.

Drill with a quarter inch bit. People say it will crack the tubs but ive never encountered that problem. Or you could melt them with a soldering iron. Drill/melt from the inside out so any sharp pieces stay on the outside of the tub.

Soldering iron works great. Just do it outside cause it will smoke a little. Go to Walmart and get one for less than $5

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if you are using a drill, I use a metal bit, as it catches nicely. Also, hold the sides while drilling, as if it flexes then you will get a crack. Let the bit do the work, and just let it catch first.

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oh, if any pieces are sticking out, I used a razor to cut it off.

I use a soldering iron from Walmart. It's $4.
You just melt holes into it. It's as easy as cutting into soft butter. I usually melt from the outside of the tub and never had problems with sharp edges. And like Zombie said, make sure to do it outside or in a well ventilated area. The melting plastic fumes are horrible and probably not healthy.

Okay thanks to all !!!

My husband drilled holes it works just fine if you get those sharp pieces run a razor blade flush at the base of the sharp edge and remove them it works just fine.

Soldering iron. Definately do it outside, it smells. Also, don't start with too many. You cam always make more to adjust as needed, but more of a pain to cover up excess holes.

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I use one of these...

http://www.rcplanet.com/Dynamite_Knu..._p/dyn3045.htm

Works like a dream and leaves very smooth symmetrical holes.