Whatever "it" is, It apparently keeps coming back for a good long while no matter how well you clean the glass and whatever "it" is, hot temperatures appear to stimulate the phenomenon.
I will just leave this here…
Posts by RichT
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I believe he meant that the off gassing of the skirt left a light film on the glass that needs to be repeatedly cleaned until the skirt stops the process of curing.
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I was told by a major mask manufacturer once that new masks can "offgas" for a year or more. I have no reason to doubt this claim since it seems that any new mask I buy needs to be "scrubbed" or burned before every trip until they settle into less aggressive (baby shampoo ,spit, defog liquid) methods of staying fog free.
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My wife has a habit of making all my trophies disappear into the back of the closet. She might let one like that sit on the shelf a bit longer.
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Very interesting design.
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Those big cuberas are always tough to guess as some of them get a really big girth. My biggest weighed 88 pounds and it only looked half that size in pics.
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My main purpose is to compare stainless steel shafts from different manufacturers at the same diameter, most important to me is 7mm. If the results vary then obviously the steel used is different, or perhaps the process ie whether they were properly heat treated. That doesn't mean I'll know what kind of steel gives what results, unfortunately I don't have faith in stated specs. This is empirical testing. Once I find the strongest shaft it will become my benchmark.
It's interesting to find out other things too, like if carbon steel shafts are really stronger than stainless at the same diameter. Or if a 6.5mm carbon steel shaft is as strong as a 9/32" US shaft.
Very interesting test Dan but Your results will most likely vary even among the same manufacturer.
Our shafts typically test out between 41-44 on the rockwell scale despite the fact we use aircraft quality, certified, center-less ground, American made 17-4 steel and have our own digitally controlled oven.
17-4 stainless steel is SUPPOSED to be approximately 17% chromium and 4 % nickel.
But, if it's not "certified", who knows what it is?!
I have seen shafts (that were supposed to be 17-4 heat treated) test out softer than non-heat treated 17-4!
Inexpensive steel as well as foreign steel is often way different than it should be and will often vary widely from batch to batch.
A manufacturer may have a batch that turns out pretty good and the next can be twisted garbage that is way softer than it should be.
Many shaft manufacturers bundle and send out their shafts to commercial ovens (for heat treatment) where time and temperature are a serious issue.
This is very very common by the way...
In addition, Inexpensive/foreign steel almost always contains unacceptable amounts of contaminants and this will result in a shaft becoming inaccurate way sooner than it should as it will get micro bends/twists from repeated use at it hits rocks, wrecks and bony fish.
