Tempil 24411 TEMPILAQ Advanced TL040 Temperature Indicating Liquid, 204 Degree C/400 Degree F, 2 oz. Ideal for Heat Treating, Brass Annealing, and Glass Production, Made in USA

It evaporates in the bottle. I used it two or three times applying literally small DOTs of Tempilaq on brass for annealing for a total of approximately 15 dots. The bottle is now half full, not because i've used that much but because it quickly reduces itself when you open the bottle. Buy the thinner and refresh your bottle here and there... also keep the mouth of the bottle very clean. Otherwise you'll have to break through a cap of dried tempilaq that has gathered on the cap and the bottle mouth.That said, yes, it is useful for annealing as a temperature indicator.

Good weapon to have in your arsenal if you anneal.

This product makes brass annealing easier. You can figure out how long to heat your cases.

I use the 700 and 750 degree TEMPILAQ to adjust the flame and rotational speed of my Annealeez brass cartridge annealing machine to achieve the ideal temperature range. Serious reloaders know that cartridge brass work-hardens with each reloading/firing cycle. Hard brass splits and lacks consistency. Annealing returns the brass to factory new ductile condition, and can be done many times. The "magic" is knowing exactly the right temperature and time so brass isn't over annealed, burned, or "just warmed' without any true softening. This paint works GREAT - but it always dries up in the bottle before it is used up (regardless of tightening the lid and storing in another air-tight container). I may try the pens next - although more expensive per oz of paint, they may actually last longer.

Worked exactly as advertised and was easier than I expected.

Began annealing brass and this was what I needed to make sure I’m getting the temperature I need. This bottles gonna last a very long time. Worth it

product does what it says, shipping was bad, no padding, glass jar plastic lid broken, leaked out inside pack age, needed some or I would have sent it back, poor packaging

Helps with temperature measurement.

desde el día que llego venia con liquido derramado. cuando lo quise usar nunca cumplió su función, si lo ponía poco tiempo expuesto a la temperatura no sucedía nada como debería ser verdad, pero si lo dejaba mas tiempo esperando que alcanzara su temperatura solo se quemaba y se quedaba pegado en vez de derretirsey por ultima queja, lo quise dejar guardado en un lugar fresco y seco cuidando que no se derramara y cuando volví a revisarlo ya estaba totalmente seco echo piedra y no hubo manera de volverlo a hacer liquido. aunque igual nunca sirvió como un indicador de que el material ya había alcanzado su temperatura.estoy seguro que el frasco que me enviaron ya venia manipulado con alguna otra sustancia por eso nunca funciono

Great product for brass annealing set up to make sure your temperature is in the correct zone.

Just what I needed to gauge heating time for annealing brass. As advertised. Easy to use.

Used it to try to judge how much to heat my 7mm rm brass. Used it on two pieces of brass to get the idea what I was looking for as I was using a drill 5/8 spark plug socket ( I think that was the size) and a propane torch. Found if I turned the lights off I could judge well enough without it ( light red ) and repeat.

The produce works great the application I'musing it in.