Elastic bands are pretty much just narrow versions of Ace bandages anyhow.
I just stopped off at the local craft shop (sewing goods, etc) and picked up three sizes of elastic bands. There was 1/4", 1/2" and 3/4" bands. The 1/4 incher is about 8 foot long, the 1/2 incher is about 4 feet long, and the 3/4 incher is about 3 feet long. They were 99 cents each.
I just tried the 1/2 inch tonight. You start with a lighter wrap pressure and then you increase the tension after you have a layer or two down.
The thing with elastic band is that it is cummulative, each layer adds more pressure. It is a flat strip so it doesn't cut in as much as a round cord would.
I didn't try putting anything underneath it, between it and the skin. So it was still a bit abrasive or pinchy feeling, but I didn't break any veins, which I have in the past using ropes or elastic round cords.
I do like the way you can keep building pressure by adding more and more layers of elastic wrap .
I have clamped with a full erection for around an hour, no damage done, just got a wore out dick and could'nt get a full erection for a few hours.
I have ADC (All Day Clamped for over 6 hours before, basically you clamp, then start to get hard, as your getting hard push the clamp towards your pubic bone, then when everything is fully engorged, from the clamp to the glans, adjust the clamp to the engorgement of your likeing, then just leave it alone. After doing this you will not be able to get a full erection for the rest of the day, but in the morning you wake up with a fat ass hard as shit woody!