What part of the turbo was glowing? The turbine housing should be of course covered up, which raises a red flag to me as what else could be glowing.

My turbo is watercooled, I'd recommend doing this if your's isn't. If your's isn't definately make sure you're turbo timing the engine shut down so that oil doesn't have a chance to coke up on the hot bearings.

Edit: I can't believe you touched the aluminum insulation while the motor was hot :+