You are absolutely correct about being slow to dry straight from the can with no added chemicals. Miss your re-coat window and it could be a week before re-coating. There is also the dreaded "wrinkles" that can happen from re-coating before it has dried when spraying an oil based enamel.
This is what I can tell you up to this point in time. The product has four claims.
1. Increases Gloss
2. Increases Hardness
3. Reduces Dry Time.
4. Compatible to use with oil based enamel paints,
The pictures above where taken 1 hour after spraying. The product was dry to the touch. I was able to re-coat after 1 hour with no wrinkling. I was a bit disappointed with the gloss level when taking the pictures, however, after four hours dry time the paint self leveled and produced a much deeper gloss. As far as Hardness, that's still to be seen.
I thought about adding a couple drops of "Japan Drier" into the paint but decided against it for two reasons.
1. Didn't want to make the paint so hard after curing it became prone to chipping due to having zero flexibility.
2. The color of the Japan Drier is a darkish Bourbon color. I didn't want it to change the color of the White enamel paint.
I give this product Five Stars as to what it says it does up to this point. Product was purchased from Tractor Supply.
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