The constant ingenuity of our modeling industry never ceases to amaze me—such is the case of colored model glue. This is novel approach which will provide a solution to an issue that many of us did not know existed.
Ammo by Mig’s statement provides the following information:
“Hold the parts together, apply the cement to the joint and allow it draw itself into the gap by capillary action. Its red [or blue] colour stands out against the plastic surface, clearly showing where it is being applied. This also allows you to be sure the entire joint is covered and will facilitate the sanding process. Completely dries in 10 minutes.”