Okay,
I got the manual and got ahold of Multiplex, they recommended a 5 cell 1100 Mah , the manual suggested a 1500 mah. The hobby store said a 5 cell would be too many volts so I ended up with a 4.8v 700 Mah. I am a little leery as the shop I went to was the closest one to house and the knowledge, attitude and service left a lot to be desired. I won't be returning unless it is to return the battery.

While surfing I discovered a Norwegian RC glider site and there was a lot of snow in the pictures so I am assuming you can glide in winter. I assume slope soaring not thermaling should work.

According to Multiplex, Krylon with many thin coats works on Evapor.

PP