I've read that Cryogenic Treated springs last significantly longer,
Has anyone done this to their Apex springs when they rebuild?

I'm just wondering would this add longevity to the seal life?

Would this even be worth the effort??

 

The only time I hear about apex seal springs is when the car sits unused for months/years at a time.

Unless you plan to let the car sit without turning the motor for months on end, I would pass. On the plus side, seal springs are extremely lightweight and cryo is costed by the pound so it would be minimal cost.

Dave