Jarrod will have a fit, but this is just Septone Top Coat Clear. It was sprayed over 2 or 3 weeks with very light coats and the occasional light sand. It then spent a week hanging in the shed in hot dry weather with a fan on it before I started cutting it.
Its really hard, you can feel it when sanding that it's well cured so I think it will stay pretty stable.
I should have used a poly really. I will on the Steampunker.