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[Tool Name:] Sandpaper & Sanding Block [Why You Need It:] 
For removing flash or injection marks, putty, glue, and ensuring a proper fit. Also good for roughing up surfaces for gluing. Don't use anything less than 220 grit or you risk scratching your model. I also recommend a sanding block for easier and more precise sanding.
Basic & Beginner Modeling Techniques - starwarsmodels.com - The Star Wars Model Kit Gallery
Why You Need It: