Adding scratch-built details greatly improves the look of a model, and styrene is the perfect material. I selected 3 great video-tutorials for you.
Thanks to TinkerTerrain and popatachi channels on YouTube for these great videos!
Scratch Built Styrene Model Tool - Like having Eight Hands! (by TinkerTerrain channel)
Working with Styrene - Part 1 (by popatachi channel)
Working with Styrene - Part 2 (by popatachi channel)
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