Wonderflex is a low-melt thermoplastic (activation temperature of 150°-170° F) with a woven fiber backing on one side. It sort of looks like very thick plastic duct tape. When heated, the material can flex and stretch into curves, including some basic compound curves as well. Due to the woven grid backing, Wonderflex can only do slight compound curves. You could make a radar-dish type shape but it would be very difficult to get it to make a tight dome.
Wonderflex is also self-adhesive, meaning if you heat up two sheets and press therm together, they will bond to one another as they cure. The more you heat the material up, the stronger this bond will become. I prefer to use a heat gun but you can also microwave smaller pieces if you prefer.
It is available in three thicknesses (.35, .45, and .69") and is shipped/sold in rolls. I buy mine from The Engineer Guy here in Atlanta
, but there are plenty
of distributors online
who also sell it.
Even the thickest of their available products is still pretty thin for very good results, so you'll see in later steps I often double or triple layer the material to make curves smoother and cleaner.