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When I use the paint tool to add a wood grain to my model, at first it shows the wood grain, but when I click the Scene that its in, the wood grain just becomes a solid colour. This normally happens in Layout before I change it from Raster to Hybrid, but why is it happening in Sketchup and how do i fix it.

Sounds like you have the style for the scene set to Shaded, not Shaded with Texture. You could edit the style and select the Shaded with Texture face style and then update the style.