Lost a whole day's run on a bad batch of generic coolant concentrate

Nancy Nguyen · 2026-04-02T19:30:04.326534+00:00

I mixed up a batch last month, and it started breaking down after about 20 hours of machine time. The parts came out with a weird, sticky film that failed inspection. Anyone have a brand they trust that doesn't gum up?

brooke7675mo ago

Check your local water hardness before blaming the concentrate. Hard water can mess with even good coolant and cause that gummy buildup. A cheap test strip might save your next batch.

4

sean7825mo ago

Noticed this happening more often with generics lately. Switched back to the brand name concentrate and haven't had a problem since.

2

terry6775mo ago

My old shop had a coolant vat turn into green slime once.

1