I wasted a couple of thousand dollars worth of NOS cork Linkert and Schebler floats by coating them with POR15.
It turned out that they wouldn't last overnight in my local P4gas!
I then pioneered the re-introduction of "nitrophyl" floats by machining them from a material similar to the original "Armstrong" floats of the '50s and '60s.
It took a few years before they became subject to swelling.
By June of '08, however, an improved formula became available, and I am able to replace any "bloats" free of charge with a material that has proven itself, so far...
Its all about the fuel, of course, and you never know what's going to come out of the next pump.
Please note that this material is still under patent with a severe royalty for molding, so it is only available in machined form.
And when I pioneered the use of PEEK for manifolds, http://virtualindian.org/9techpeek.htm
, several thing became apparent about insuring its success.
First, bubble-testing is manditory for certainty of a perfect seal: http://virtualindian.org/11techleaktest.html
The next was that the seal must be a tight, "stretch-on" fit, with no blemishes upon the manifold spigots, If worn the ends of the spigots were larger than the sealing area. If scarred or nicked, the blemishes impressed into the PEEK, greatly reducing their chances of sealing, and greatly reducing the re-useability of the expensive seals in the future.
Slip fits required excessive torque upon the nuts, the very thing that PEEK was intended to avoid.
Even brand new manifolds from different sources varied too greatly for me to cut them "blind".
Then, on this forum, the problem of repeated loosening of the nuts was brought to light.
It turns out that orignal brass seals were quite thin, so that they would arc when under pressure of the nut, and bite into the spigot.
Thin PEEK however, arches too easily, and continues to comply and buckle, requiring several re-torques, with dangers of leaks in between.
The solution is to maximize the thickness of the seal to the insides of the nuts. This also allows for more support across the gaps between spigots and nipples.
Given the variation between spigots and even today's commercial nuts, custom-fitting gives the best assurance of a lasting seal, and re-useability.
On to the sealer for the nipples themselves, the host of the forum suggested Permatex's "The Right Stuff", and used it upon their 'signature' Anders knucks.
Although it warns agains use with fuels on the can, I fould it to survive miraculously in my immersion tests!