Hi hoppercarmaker, and welcome to the Gauge.
I use lacquer thinner as a solvent glue for joining any kind of styrene, including Walthers kits. Since I also use it for thinning Floquil and other lacquer-based paints, I buy it by the gallon. Much cheaper than Testors, and it works just as well. I decant it into a Testors bottle (the one with the brush in the cap), and for very fine work, I use a suitably-sized paint brush. As with any solvent, good ventilation is a must.
Wayne