Give the underneath a nice, sand scrub and removed the T-Nuts today, followed by 2 coats of clear gloss( out the can). Still undecided on wether to keep the inserts or replace so I used a syringe to fill with water to stop the clear sticking to the critical part. Don't know if this has been done before, but it worked a treat 
The water in the inserts is a great idea, very handy trick
