I have had success using an enamel wash over existing enamel paint. The thing you have to do is wait at least 7 to 10 days after the last coat of paint on the deck. Afterward you should be able to use a dark wash over the deck with no problems.
I should mention that I use Humbrol paints exclusively on my projects. This paint is very easy to paint right from the tin and it also self-levels when brush painted so there are no brush marks.
The technique I use as been given to me by a fellow modeller from Model Warships. First I paint the deck an overall tan color and when everything is dry I use a earth brown wash over the tan. I brush the wash until the tinner becomes a bit sticky to create "streaks" that looks like wood grain. I then use a wash of black paint that I brush over everything and I wipe the excess with a non lint cloth. This operation is important because it removes the excess black paint and it gives a sense of shadows around details and it kind of fuses the tan color with the earth brown color.
You can see examples of this technique here:
http://www.modelshipgallery.com/gallery ... index.html
I used this technique on the Veneto and on the Hood. Bismarck and Warspite didn't get the dark wash and they used another shade of brown that ended up being a bit too orange for my taste.
Hope it helps! I too was a bit frightened when I did my first wash but it's actually easier to do than it seems. If you feel unconfortable just try it out on a test model or any piece of styrene you have lying about.
Cheers

I have had success using an enamel wash over existing enamel paint. The thing you have to do is wait at least 7 to 10 days after the last coat of paint on the deck. Afterward you should be able to use a dark wash over the deck with no problems.
I should mention that I use Humbrol paints exclusively on my projects. This paint is very easy to paint right from the tin and it also self-levels when brush painted so there are no brush marks.
The technique I use as been given to me by a fellow modeller from Model Warships. First I paint the deck an overall tan color and when everything is dry I use a earth brown wash over the tan. I brush the wash until the tinner becomes a bit sticky to create "streaks" that looks like wood grain. I then use a wash of black paint that I brush over everything and I wipe the excess with a non lint cloth. This operation is important because it removes the excess black paint and it gives a sense of shadows around details and it kind of fuses the tan color with the earth brown color.
You can see examples of this technique here: [url]http://www.modelshipgallery.com/gallery/users/Sylvain-Auger/user-index.html[/url]
I used this technique on the Veneto and on the Hood. Bismarck and Warspite didn't get the dark wash and they used another shade of brown that ended up being a bit too orange for my taste.
Hope it helps! I too was a bit frightened when I did my first wash but it's actually easier to do than it seems. If you feel unconfortable just try it out on a test model or any piece of styrene you have lying about.
Cheers :wave_1: