Opaque Pre-Mix

Built for the photograph

This is the fluid for a build that gets shot. Solid, saturated colour reads consistently under studio light in a way a translucent dyed fluid never does, because there is no depth-dependent colour shift — a 16 mm tube and a full reservoir show the same colour.

It is listed for experienced builders

PrimoChill flags this one for people who already know their way around a loop, and the reason is maintenance discipline rather than difficulty of use. An opaque fluid needs daily colour-separation checks early on, because you cannot see trouble developing through it the way you can in a clear loop.

Prep is not optional here

Every warning that applies to Vue applies here — this is the same suspension chemistry. Residual machining oil or flux will interfere with the pigment suspension, and the failure mode is visible separation rather than a subtle haze. Run a full prep — Rad Clean, SysPrep, PrimoPrep — before the first fill.

Opaque Pre-Mix’s in-loop lifespan depends on how you run it, not the calendar — pump speed and system complexity both wear the suspension down faster than time alone. Light, occasional use can carry a fill well past a year; a loop run hard and continuously can wear one out in weeks. Unopened, the bottle is good for 2 years from purchase — install and use it within a reasonable window rather than letting it sit. Top up only with more Opaque Pre-Mix, never plain water.