Great that you got your hands on another field!!

I'm not a fan of overlays, and while they look great in the short term - they will not hold up down the track and will ultimately detract from the resell value (if that is important to you).

As soon as you start tightening down posts down onto the overlay, it will want to pull away from the timber as the post is turned resulting in delamination. That stress, is only further magnified when you unleash a pinball into the area, as every bump against the post will help unsettle the adhesive and lift the overlays edge.

I think the best option would be to pull the mini-field apart, and look at getting it refinished with a new 'diamond plate' aka 2pack clear coat. This will address all previous issues, and keep things nicely protected through further years of use.

Timbo