Yes you can paint it about any color or camouflage colors as you wish but keep the following in mind:
Although you can use any color stay away from white or bright colors. Bright colors reflect sun light and heat better as well. In countries with very strong, bright, hot and continuous sunshine, the LNB will suffer from sunburn and melts.
Clean the dish and remove all the rust. Paint the dish with a very thin layer of undercoat. Paint the dish with a very thin layer of “non gloss” paint. The non gloss (mat) paint will reflect less heat from the sun to the LNB.
What will happen when the sun moves behind the satellite? That means that the sun, satellite and your dish are in a straight line.
During the months of March and October, the sun goes directly behind Astra 28.2’E
This can have two effects: