Don't do it that way. You can only paint Hammerite onto Hammerite. Anything else will react with it. Try this sage green..... https://www.paints4trade.com/hammer-finish---hammerite-type-paint-2605-p.asp
Page refresh fail (and slow typing) on my part! I remember it as adequate if the final coat was a light one - but this was in the previous century! Modern alchemy will be different.
@MrE started
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Don't do it that way. You can only paint Hammerite onto Hammerite. Anything else will react with it.
Try this sage green.....
https://www.paints4trade.com/hammer-finish---hammerite-type-paint-2605-p.asp