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So I have been wanting to add mud and stuff to my tau vehicles. So I test techniques on my predator, namely rusting and mud
The rust was calvary brown mixed with charred brown with water.
While the mud what a another mixture of Charred brown and Calvary brown, but at a 2:1 ratio. and then a drop of water, stippled with a sponge.
Then pure charred brown for a fresher looking mud.
Please, I need help.

The pictures aren't too clear, but I see your barrel is very rusty looking, if it's the look you were going for, it looks well, but the mud doesnt look all that realistic, try looking at WWII weathering effects online?

What about the mud doesn't look convincing?

This is how I did mud,

Get actual dirt from your garden. mix it with some PVA an Water 1:1.
Stir it up and splatter it on your vehicles. let it dry overnight and paint it with various browns form dark to some lighter drybrushes.
The rust is easy, my Local store sells these rust effect pots for 7,50 euro. http://www.modelmates.co.uk/en-UK/Opaque_Rust_Effect/Opaque_Rust_Effect.html

This is how my Pred came out:

Hope this helps!

I actually think your mud looks ok for fresh new mud, but because of the rest of the vehicle is perfectly clean it looks like the tank rolled straight out of the factory and in to wet mud. There's no dried mud (google "muddy cars/trucks/vehicles" and you'll notice mud actually dries a much paler, dusty looking colour).

I think it needs a bit more weathering over the rest of the vehicle, a bit of widespread dust, some dirt around the bolt/rivet heads, a few paint scratches, maybe some streaky dirt.

There's a lot of good tutorials online, just google "tank weathering" and you'll find a lot of stuff. Otherwise the Imperial Armour Masterclass books are good, and there's some good books on non-GW real world tank modelling as well. We had a thread about it a while back...

http://www.dakkadakka.com/dakkaforum/posts/list/480906.page#4849605

Here's a good and basic tutorial on dakka... (you'll find some tutorials start using oil paints and weathering powders, which are good techiniques if you want to do it, but I personally think this looks good for using stuff you probably already have in your modelling inventory).

http://www.dakkadakka.com/wiki/en/Tank_Weathering

Well i tried to real mud thing, didnt work to well.
The tank looks ok. But still far to clean.
If i can get my hands on these should I?
http://www.thewarstore.com/product33268.html
and
http://www.thewarstore.com/product33270.html

I'd just start looking online at weathering techniques and decide what you want to do. There's a lot of options with weathering powders, oil paints and just techniques that don't use any special powders or paints.

You have to have an idea of how you want it to look before you start, look at some forge world vehicles, just google "weathering tanks"...

https://www.google.com/search?q=weathering+tanks&oe=utf-8&aq=t&rls=org.mozilla:en-GBfficial&client=firefox-a&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=d76MUK2QL8Xu0gHKmoCoDw&biw=991&bih=914&sei=er6MUIKULbOs0AG4mIEQ

Have a think about how you want the tank to look, and then if you have questions about a specific technique, let us know.

Same here: take a good search online because there`s plenty of stuff to help you make mud. Tamiya weathering sets can be used to good effect, but if you want to make nice cakey mud, try AK interactive or vallejo weathering sets. Even FW has weathering pigments. The Dutch company RealityInScale actually makes something called mud-in-a-pot which boils it down to one step. There is a myriad of techniques and how to`s online. Try searching on forums like planetarmor, missing-lynx or armorama for tips on weathering

dried mud using AK interactive weathering materials

layered mud buildup by Karl Hoy on Armorama

youtube clip on making a muddy baneblade

As for your rust: I think the barrel of your Pred is too heavily done. A barrel that rusted would be unusable no matter what millenium you live in. Try looking into something called the hairspray technique. Massive Voodoo has probably got something on their blog about it and the same goes for the aforementioned forums.