White glue or matte medium for securing ballast?

[Tyson Rayles]

I have been using the Peco code 55 in N scale and Elmer's white glue mixed 50/50 with water for over 20 years now and have had zero problems but I DO NOT rely on rail joiners. Every joint is soldered and wires are soldered to each side of joints with insulated joiners. As far as the track getting tarnished I wouldn't know as all my track is painted.