I would not recommend DuracottonHt or Duracotton98 on light garments except white and grey. Some users reported that the transferred image shows a white polymer box after the shirt has been washed.
Here are some opaque that I have tried:
Inronall for dark - very stretchy, thin and softer hand than most opaque. It is meant for inkjet but I have used it with the laser printer. It is safe for low heat dryer. I have wash fastness issue though. The laser print losses some of the color. I may have not pressed it long enough. The inkjet print looked washed out before and after wash. But held up through the wash better than the laser print.
http://www.t-shirtforums.com/attachm...k-comparis.jpg Airwaves Fabric Opaque - made of pressure sensitive 100% polymer fabric. The material is thicker than most opaque. Has hand like Ironall for dark. This is a two step process. I have used this with Imageclip.
http://www.t-shirtforums.com/attachm...cn0143web1.jpg Forever Dark - one step process. Color is vivid. Feels like raincoat. Very glossy. Cracks and peels after it has been through low heat dryer setting once. The image below show how badly the opaque is cracked.
http://www.t-shirtforums.com/attachm...s-fscn0032.jpg
There are others I have not tried that are made for laser printer:
Neenah Opaque1 - one step process. Made by the same company that made Imageclip
Transfer technology opaque - one step process
BestBlanks has one a two step process also.
Wow 7.1 - self weeding opaque. Multi step process. Need to get a second mortgage to be able to afford this paper.
There are others that I have not come accross yet.
All the opaque I covered need to be trimmed with a scissor or vinyl cutter except Wow 7.1