HHIP 8030-8355 Dykem Hi-Spot Blue.55 oz. Tube

Tool and die maker here. I’ve used different brands of high spot blue. This is the best. It instantly goes on nice and covers surface quickly. This does not come off your skin easily. To test this simply apply some blue underneath the handles of your buddies toolbox. Watch with delight as they struggle to wash it off. All kidding aside this is my go to high spot blue

This stuff is great for finding high spots between fitted parts -- which of course is what it's made for. I found its results clearer than when fitting with Prussian blue. I used it to fit an Ed Brown pistol barrel to a 1911 pistol. The barrels are machined slightly oversize to accomodate fitting into 1911s from different manufacturers, so finding the high spots and filing them was part of the installation. They recommended using a black marker, assembling, and looking for removed marker. I couldn't get the fit until I used Hi-Spot Blue, which made finding the high spots easy. My only complaint is that for a tinkerer like me, this is a two-lifetime's supply. (Since it is non-drying, it will probably be fine at the estate sale.) I'd like a small container about one quarter as large. Working machinists swear by this stuff, and would probably go through a couple of tubes a year.

Works really good. Better than Prussian blue. I like how thin it goes on the part.

Been struggling with Prussian blue for a year, this stuff was instant relief from eye strain trying to find light marks. It costs almost $25 an ounce, but that's for a lifetime supply for me. It's so dark and dense I will try mixing it with the Prussian blue. So far I've tested with alcohol, paint thinner, acetone, and brake cleaner, and they all remove it great on non-porous surfaces. Wear gloves, it is impossible to remove from hands, wood, concrete.

Works as it should, its the product to use for hand ffitting any parts I use a q-tip and a tiny amount because you will make a huge mess if you use too much.