I have that as well. I tried out on the cowl that goes on my Victa Twin ( as it is mostly obscured by the plastic dress cowl) and wow, you could have a shave from the mirror like gloss.
That is what prompted me to go for a more subdued finish as I think extreme gloss contrasts too much with the plastic dress cowl as it sticks out the side.
In the case of that side pull above without a dress cowl, it looks very smart and enhances the whole machine despite the shabby paint on the base.
The Killrust paint is not fast drying at all, but the Wattyl semi gloss still feels a tiny bit tacky after 20 hours, so I think I'll give it a few days before installing it back on the mower.
I wish I still had some of my Wurth Sabesto lacquer semi gloss left as it was super fast drying and could be handle in less than ten minutes!
Might order some more. A bit exy but very useful.
You could also try using an etch primer to provide a key for the new paint. I think we used a Wurth paint at the dealer that was fast drying. Unfortunately it seems to be quite hard to find locally.