So in theory then, if a person cryo'd a wiseco piston....it should hold up a little longer right? Here's what's floating around in my head....if you cryogenic something,  you are basically aligning its molecules closer together right?  That's where the strength comes from?  So if they are closer, wouldn't this change the size of the object as minuscule as it may be?

The hardness and decreased ware of the plated bores is just a byproduct of these hard plating.  I have not seen anyone talking about the main reason for plating cylinder bores.  Iron transfers heat at approximately 1/2 the rate as aluminum. 

The engine industry had to find a way to dissipate heat from problematic areas in some high performance engines about 40 years ago.  Yamaha began using chrome plating in there road racing engines around 1966.  Mahle developed the Nikasil process for Porsche around 1970.  Kawasaki developed the electrofusion process in the early 1970s.

As the power levels of stock engines continued to go up, the engine manufactures had to abandon the iron cylinder sleeves.  The addition of power valves in two-stroke cylinders created more heat dissipation issues in the vicinity of the exhaust ports making plated bores an absolute necessity.

Replacing an iron sleeve with a plated aluminum sleeve will provide improved heat dissipation over an iron sleeve but will not provide the heat dissipation of a cylinder without a plated aluminum sleeve.

The heat transfer is hindered anytime there is a discontinuity in the metal between the surface of the bore and the water jacket or cooling fins.  Even though the junction between a sleeve and the cylinder is a tight press-fit the heat flow through this junction is dramatically hindered.

Mitch , look at the 4 the paragraph. He already answered it.  Yes it will be better than Iron. But not as good as a cast  cylinder with no liner. The liner wouldn't bear any significant benefit to the piston.
You could possibly run a tighter fit if the expansion rates were better matched. But in the end pipe choice engine load, lengths of runs all play more into the the piston life.
Really need a better piston, longer rod, taller cylinder etc to improve piston life.

Really need a better piston, longer rod, taller cylinder etc to improve piston life.

Oh well thats all it needs...............

so what you are saying is if you have a 88.5 bore, you should get this done to help make cylinder last longer.
and it will be ok. how often do you think you would need to get this done. like every 4 or 5 pistons.

DEZ that's a loaded Question. How hard you want to run, how long a stretch at what HP? This will all effect minimum clearance.

  I have one plated cylinder bet I have run 6 pistons in it so far. Hit the top above the ports with a dingle berry and your good.
I do just enough to get a quick ring seal.  This is not really a new thing just not talked about much. I suggest it in some cases depends on the cylinder and porting. Also after its coated you don't want to be porting in there it exposes a open edge for oil to penetrate and the rings to catch.

AND IVE HAD A BAD EXPERIENCE WITH A COMPANY OTHER THAN MILLENIUM OR US CHROME doing these. My Q cylinder that was out in Glamis, was ruined by leaving in the Etch tank too long or too strong a solution used. They told me it was due to Suzuki's poor aluminum Quality. It looked like it had been packed in a pail of rock salt when I got it back and LITERALLY sprayed my legs with coolant once coming up to temperature. We tried everything to fix it.... I have @ 1500 into a paperweight, between original porting cost machine work plating shipping all over hell. 

So just be forewarned Im 50/50 so far. The way most guys run, a properly sleeved NW cylinder will easily IF MAINTAINED Properly outlast your interest in these bikes. That said plating is half the cost to a hundred bucks less than a Sleeved cylinder if you can do it.

I will DO it again on a cylinder Im happy with and like.

If the bore is not damaged or egged out, they will slightly overbore it and Nkikisil it back to 86.5 if you want. I belive the coating can be applied up to .3mm thick.

and how long does that last?
and when its time to get it coated again will it still be same bore.

Sure seems like there will be a shortage in the future. There's a shortage already!
I'm telling ya guys, the combo of a coated piston on a nikasil bore wears alot longer than non.
my YZ125 was wide open almost every day for 2 years without any noticeable wear on the bore. The vertex piston was the only piston I ever put in it, and the rings were changed once just because I wanted to. I wish vertex made a piston for us.

Sure seems like there will be a shortage in the future. There's a shortage already!
I'm telling ya guys, the combo of a coated piston on a nikasil bore wears alot longer than non.
my YZ125 was wide open almost every day for 2 years without any noticeable wear on the bore. The vertex piston was the only piston I ever put in it, and the rings were changed once just because I wanted to. I wish vertex made a piston for us.

There is a big difference between a piston getting loose because of ware and a piston collapsing.  Coating the skirts with friction/anti-ware agents WILL not prevent the piston skirts from collapsing.  Large diameter forged pistons are more prone to rapid collapsing.  The forged 125cc and smaller bores do not have as much of a problem as the 250 and 500 size forged pistons.