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Tempilaq 650°F is a temperature indicating liquid that does one job extremely well: it tells you the instant a surface reaches 650 degrees Fahrenheit (343°C). You brush a thin coat onto your workpiece, let it dry into a dull opaque film, then apply heat. The moment the metal hits the rated temperature, the coating liquefies and leaves a distinctly different mark behind. No calibration, no batteries, no guessing.
What makes this stuff trustworthy is the accuracy. The formula melts within about one percent of its rated Fahrenheit temperature, which is why so many people lean on it for jobs where being close isn't good enough. It's non-flammable, dries fast on both horizontal and vertical surfaces, and the advanced formula is built to resist settling in the bottle so it stays consistent coat after coat. It works on polished metal, glass, plastics, and rubber.
The 650°F rating is one of the most popular choices in the brass annealing crowd, and for good reason. Machine makers like Bench Source commonly recommend painting 650 Tempilaq on the neck and shoulder, with a lower temp product down the case body to watch for heat creep toward the head. A trick worth knowing: apply a small drop inside the case neck rather than directly in the flame path, since the liquid burns off if the torch hits it directly. When it turns clear, you've confirmed your dwell time is dialed in. Most folks use it to set up timing on sacrificial brass, then run their good cases with confidence.
A little goes a long way here. Keep the bottle away from heat sources so the carrier fluid doesn't dry out early, stir or shake before use, and wipe fresh melt off with a Q-tip while it's still warm to save yourself a scrubbing job later. Whether you're annealing cartridge brass, heat-treating small parts, or doing preventive maintenance checks, this is a simple tool that earns its spot on the bench.
It's a temperature indicating liquid that confirms when a surface reaches exactly 650 degrees Fahrenheit. You paint it on, apply heat, and the coating melts and changes appearance the moment the target temp is hit. It's widely used for brass annealing, heat-treating, and preventive maintenance checks where you need to verify heat without a pyrometer.
A common method is applying a small drop inside the case neck or a stripe down the neck and shoulder, then heating until the coating melts clear. Many annealing machine makers, including Bench Source, recommend the 650°F product on the neck and shoulder area with a lower temp version on the case body to watch for heat migration. Set your timing on scrap brass first, and keep the flame off the Tempilaq itself since it will burn away if hit directly.
The advanced formula melts within about one percent of its rated Fahrenheit temperature, so it's plenty precise for reloading and shop work. It requires no calibration and no equipment, which is a big part of why people trust it. Just keep in mind that brass thickness and alloy can vary between manufacturers, so setting up on sacrificial cases is always smart.
The melted coating solidifies into a hardened clear puddle as it cools, and inside a case neck it can be a bit of a chore to remove. The easy fix is to wipe it out with a Q-tip while it's still warm right after annealing. Many reloaders only use it during setup on scrap brass, then run their good cases without any coating at all.
| UPC | 608050122101 |
|---|---|
| Manufacturer |
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