DYKEM Cross Check Torque Seal Tamper-Proof Indicator ($8.22 each when ordering 25 or more)

Easy to apply and will definitely indicate if something has moved. Be careful about the color choice. I picked blue so that it wouldn’t be too obvious on a black surface. I should have gone with a lighter color. The dried paint is rugged enough to stand up to vibration but it will crack to immediately show if something has moved.

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Works as advertised great product

worked like a charm

I always have a tube of this on hand when working on my Jeep. It is a must have.

Good price. Easy transaction.

I go through two-three tubes of this stuff a day at work. I had no idea it was so pricey. Glad I'm not paying for it. Anyways, I work at a test center for one of the large vehicle manufacturers and we put this stuff on every single fastener after torquing them to spec so that we can check with a glance during out inspections that all the fasteners are still tight. It also doubles as a movement checker too. I've crossed gaps in body panels, where two brackets collide, and even put it on a tool box to see if someone was taking my tools when I wasn't around. Great stuff. Pricey, but great. I'll just be 'borrowing' it from work when I need it.

Works good, only downside is it's like anti-seize, if you look at it wrong, it's all over everything, including you. I'd prefer it to be a little thicker consistency, and a smaller tip, it would make it easier to apply. Other than that, the color is clear, easy to see, and once it dries, its solid, so if there's any unwanted movement of the bolt/nut/whatever, you can clearly see it cracked or sometimes completely flaked off, which is exactly what it is supposed to do.