Blue fence not dark enough!

I painted my garden fence with Ronseal Fence Life Plus midnight blue fence paint and there is nothing midnight about it! It's more of a darker shade of teal, the effect I was going for was a dark blue. I'm thinking of painting over it with a grey to darken it, will this get the desired effect or completely make a mess of it? Any suggestions welcome! Thanks

 

Well, yes if you want a grey fence it will work.
But surely to get dark blue you need a dark blue paint.
But I'm no artist.

 

I should have mentioned that I have looked for a dark blue but they don't seem to be dark enough which is why I went for the Ronseal one. I was thinking of applying a single coat of grey to make it ore of a blue grey shade but darker!

 

Well try a small area first.

 

Ronseal Fence Life Plus - Midnight Blue 5L
From the Homebase site pic there, it looks like you've got exactly what they say you're going to get. I wouldn't call it midnight blue either, but the colour in the picture is exactly the kind of dark teal you describe.

I'm a fan of Cuprinol Garden Shades myself. Their "Iris" might be more like what you want.
Cuprinol Garden Shades - Colour & Protect | Cuprinol

Two coats should cover up whatever's underneath.