Time to put some "non" back into the skid?
There was, in the past, a pic posted up of an older Ericson with aftermarket screwed-down teak decks. Probably a bad idea for a host of reasons...
However, the modern synthetic teak might be OK, since it is epoxied down, just like new boat builders have been doing for the last decade with real teak.
After all, Treadmaster (c) decking has always been "glued" down with an epoxy type adhesive. I know of a boat with that surface on the deck that is almost 30 years old and while the material is now about ready for replacement, it still functions as reasonably good non-skid.
If your old factory deck gel coat - including the non-skid - is about shot, not to mention thinning out enough to see the pattern of the glass in the substrate, you do need to do something.
Whether prepping and applying a new sanded LPU surface or shooting the smooth parts in LPU and then laying a new pattern of Treadmaster or TekDek, it is probably time to "start over" on a whole host of boats that are homing in on their 4th decade of life.
Post some project pics of your solution, whatever you decide. We're all curious...
http://www.tekdekusa.com/
http://www.tiflex.co.uk/marine/marine.html
Cheers,
Loren