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MintLP Protractor Issue. Anyone else?

Hello,
I went to use my MintLP Protractor last week to do a re-check of Arm, cause I had dis-mounted the Arm.

Last time I used it, was when I first recieved it, over a good year ago, maybe closer to two years.

What I have noticed with mine, that it was once a frosted transluscent clear overlay over a sheet of glass mirror has now changed.

Now I notice, that clear frosted color of the overlay has turned a dirty brown stained color. Anyone else have this happen?

Whether any other detrimental effects have occured, I am unsure, but this Protractor was always kept wrapped in its protective Plastic Bag, in its Cardboard Shipping Box, it shouldn't have turned a brown color, expecially not for what this protractor cost.

I'm thinking of emailing Yip, and asking why this happened, and what can be done about it? Mark

markd51

Showing 2 responses by dan_ed

dan_ed
2,451 posts
 
I'll send Yip an email and ask him for input. He really is very friendly and helpful and approachable. I don't know why people don't just ask him. ;-)

I have an older MintLP for my Triplanar that does show the material under the overlay has turned brown like the OP reports. The overlay itself is clear and clean. This material under the overlay appears to be an aide to facilitate using the mirrored surface. I suspect Yip may have found a substitute at some point that doesn't fade like this.

I don't think this is a cleaning issue. However, from the front page of the MintLP intstructions:

"The plastic surface can only be cleaned with lighter fluid [i.e. white petroleum] by a soft dry cloth. WATER, and any other kind of cleaner, water base or whatever, SHOULD NEVER BE USED.

I have no financial interest in MintLP, but I am a very happy customer.
dan_ed
2,451 posts
 
Mark,

the discoloration I see is definitely under the overlay. It looks like Yip scrapes this material away from the area around the null points, and at those points I see no discoloration. This is why I believe it is not the surface of the overlay. If yours is not foggy looking after using the alcohol I wouldn't worry about it. But, don't do that. Obviously. :-)
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