Hello fellows, wargamers, hobbyists, and miniature enthusiasts. As requested by MR.Lee I have prepared a tutorial for you on how to make your bike dirty with pigments. For this effect I used Vallejo Pigments: Brown Iron Oxide and Light Yellow Ochre.
Step 1. I have began by putting the Brown Pigment into a container and mixind it with water to achieve almost fluid-like consistency.
Step 2. I applied the watered-down Brown Iron Oxide pigment on the bike's wheel. Try to apply it on the highest parts and dirty up the wheel's plating a bit as well it will look more natural.
Step 3. I repeated the same thing from step 1 with the Yellow pigment but this time I added less water. I wanted it to be more chunky then the brown pigment. I applied the pigment into the wheels' recesses and all the gaps. Don't worry if it gets too clumpy and starts to cover details we will clean that up in a moment.
Step 4. Take a moist cotton pad or a paper towel and start cleaning up the pigment from the section of the wheel that touches the ground the most. That is done because any dirt and mud won't stick for too long on this part.
Step 6. If you are satisfied with the result, leave the bike over night to dry before sealing the pigment but if you think it's still too dirty you can come back with a paper towel and repeat step 4.
I would recommend using Vallejo pigment fixer but with so much pigment any varnish in a spray can does the trick.
This is the end result...
Hope you like this simple tutorial. If you have any questions, leave them in the comment section below.
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Feed your Imagination,