Product is completely substandard to the original impact spray MARKIT.
Ive been using markit for over 5 years as a teaching professional and have found it superior in all aspects.

This is a dangerous product. Where do you keep it? In your golf bag. Where is your golf bag? In your car. My can exploded in the car destroying the pocket on my bag and spraying my car, my bag, my clubs, my shoes, with fine yellow paint dust impossible to remove. Parts flew all over my car. Golf tees flew like projectiles! Good thing no one was in the car at the time or these people would have a major law suit on their hands! The warning on the can says not to expose to more than 50 degrees celsius. That's 122 F. Don't believe it.

I tried this product and found the same results as others did on foggy damp mornings. CLUMPING. Also, I am a cigar guy and when away from home and my wife, enjoy my MC's.. However while holding my cigar and club in my left hand, and spraying my club, I witnessed the biggest yellow fireball I have ever seen. I was fortunate to be wearing my glove otherwise the smoking leather would have been flesh. I like the idea of the powder and found I another brand. It is called Markit and is available at Markit-Golf.com. Great product and safe. If you are trying to improve as I am, I would buy Markit instead. As a side note, I wonder how much liability insurance these guys have? I can't find any location for them.

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Markit-Golf.com has a product that I tried. It works well in damp and even wet weather. It produces a very fine image that I can see if I have not made a square hit. It is more expensive but the image results speak for themselves and I get twicw the number of applications as On-Mark. So it would seem that Markit is a better value. I never practice without it.

This thing is very cool, and fun to see where you hit the ball

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For someone who cannot otherwise tell where impact on the clubhead was made, this is a viable option to assist them. It's easy to apply, dries fast, and wipes away clean with a few strokes of the golf towel. As other testers have stated, this is to be used on dry days only to avoid the spray from clumping in wet weather. All things considered, if the choices were between impact tape or the spray, I'd go with the On-Mark spray.

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This is an interesting product that gives higher-handicappers like me some good feedback on where I'm hitting the ball on the clubface. A brochure that comes with the can explains what it means if you hit the ball in different areas, and you have an idea how to correct it. I did try it on a wet, foggy morning recently just to see what would happen. The powder clumped.

I tried this product on the recommendation of a friend and did find it somewhat useful. Being a purist in all things golf, I'm not one who goes for gimmick products, and this one does seem kind of gimmicky to me. But only because I think golfers should "feel" the ball hit the clubface and know exactly from impact where they have hit it on the clubface. But not all clubs provide very good feedback these days, so I imagine this product can be helpful to beginning golfers or those golfers whose clubs do not provide feedback on the range like a good old set of blades does.

I'm a teaching professional and have seen many products come and go over the years. This is a good product for teaching and for after lessons when someone still wants to measure their results. The spray is easy to use and easy to remove. My only complaint is that you can't use it when the grass is wet, which it often is on winter mornings here in Northern California. Other than that, when I spray it on a clubface and show someone exactly where they're hitting the ball, it helps visualize correcting the problem. Plus, at $11 it's a bargain.

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This product makes practice easy and informative. Instead of just making informed guesses on your ball-striking, the On-Mark spray gives an accurate picture, right there on your clubface, of exactly where you're hitting the ball. Very helpful.

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