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Could you use regular wood stain? Artist oils will give you a better range, but just thinking of cost
That's a good point about the PVC repelling, but I'd think after sanding it and scoring it you would have made it a little more receptive to an oil based stain. I'd love for you to try and post results, but since you've got tactile feedback already, you're probably right - I'm guessing it will look thin and watered down.