That will help a little, but throw (Or paint) some 6" wide bands on the outboard side of the wings - Or paint about 8 - 10" of the wingtips red, Blue, or some other dark color (Not yellow, or light blue etc)

A big white plane will be very hard to see when it's up in the sky!

I also recommend using Ultracote to cover it with. It's the most user-friendly of all the coverings