Try oracover from www.hobby-lobby.com
it is three times heavier than Solite but seeing that you don't use that much to cover a plan the size of a typical parkflyer - they weight doesn't add up that much. Compared to other covering it is very light weight - just heavier than Solite. From reading about everyone else using Solite, the oracover is easier to work with and doesn't suffer the same bad habbits that Solite does.
Give it a try.