Hiya. I use hockey tape for all my hoops, as a base before I decorate. I don't have the curl problem but I make sure to cut the tape with scissors at the end to make it look neat and tidy.
As for making hoops rounder, try smaller connectors and/or 2 or more of therm so the hoops are balance. After that just working with them - HOOP HOOP - should make them much rounder.
Happy hooping.

Speaking of unround hoops, I've noticed that mine are changing shape when I leave them in my car and they get hot. Any tips on traveling with hoops?

Thanks, paponda

speaking of that oblong shape that hoops .....what do you do when someone gets a hoop from you and notices that shape and feels like it is broken? my hoops are very secure, but sometimes there is just nothing you can do about that corner because of the material being so rigid.

eiiiii.....hoooppplaaaaaa

I use hockey tape on all my hoops. I don't encounter the rolled edges with mine. The brand is Jaybird Hockey USA. I get it a Sports Chalet for $1.99 a roll.

The tricky part is that they only have red, black, navy blue, white, marigold yellow and white here. I have to figure out how to make cool designs with the limited color. I also think that it has the best grip but with the lack of color choices, I also use gaffers tape. I use mylar and hollogram but wrap the gaffers around the edges to protect the edges from scuffing when dropping the hoop. Watch out, the hockey tape gets dirty fast, especially when you drop it in dirt. It also rips easily if you hit your hoop on stucco (I hoop on my stucco surrounded balcony). I think it tears the most easily next to the mylar and hollogram tapes.

New discovery!

While shopping for hockey tape, I found wrapping sponge. It's also $1.99 a roll. When I saw it, I thought it was a small peach hockey puck. It looks like a roll of ace bandage.

I was hoping to duplicate the soft padding of the excercise hoop I started hooping with. I wrapped my hoop with 3 thick layers of the sponge tape. For body control, it does give more grip. It's best for hand hooping. That's my boniest of parts and they haven't bruised at all. I can't wait to try it hip and knee hooping. I highly reccomend the sponge tape. 1 roll should wrap thickly around your hoop 3-4 times.