I have heard of these before but never from someone who actually owns a set. For salty roads these seem like a must have.

Here is a DIY one:

link: https://www.rs25.com/forums/f105/t14...uspension.html

Some links to more:
http://k-tuned.3dcartstores.com/Coil...air_p_770.html
https://www.kirkeyracing.com/categor...oil-Over-Cover
https://www.metaltech4x4.com/icon-sh...-covers-small/

Does anyone here have experience with these?

 

I don't really see the point the springs aren't really gonna rust before it's time to replace them

 

BC springs can start to rust only after 2-3 winters in the salt belt.

 

https://forums.vwvortex.com/showthre...r-Wraps-Covers - post #3

Besides rust, salt and sand can ruin the threads and possibly work itself into the body. I suppose if you rinse them off regularly you'll be fine....or just not live in the rust belt.

 

A coilover Condon? Another reason I enjoy Struts for road driven cars...There's a coilover or two that features a durable anodized threaded body...but they're high dollar...

 

I greased my threads which kept them decent but the paint on the springs didnt last.