AMMO by MIG Red Magma Cement (30mL)

From the Manufacturer:

Red colour extra-thin cement for use in assembling plastic scale models.

Hold the parts together, apply the cement to the joint and allow it draw itself into the gap by capillary action. Its red colour stands out against the plastic surface, clearly showing where it is being applied. This also allows you be sure the entire joint is covered and will facilitate the sanding process. Completely dries in 10 minutes.