I am told that Slipstream, Goldwing etc are the same aircraft or atleast from the same factory. In that case, the covering would be Oracover. I am not sure who carries Oracover internationally. My LHS has some but is such old stock, its quite unusable. Pheonix (atleast their more expensive models) use the same stuff, so do Black Horse, Seagull, Pilot RC etc. May be this information can help

Ameyam