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I have several wood pieces with cracks/splits/ect. Is there something I can fill the cracks with that would survive the CNC router process? And still be able to take stain or even paint?
 

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Much depends on how wide and deep the cracks are and what your project is. There are any number of wood fillers that will take stain and paint. If the crack is wide, though, any of the fillers that I have tried will be visible after staining. Paint will cover them, though. For painted work, Milliput is excellent. It is a two-part moldable epoxy putty. It does not stain well, though. If you are limited to big box stores, both Bondo and Dap make fillers that will take stain and paint.

If you have specialty stores near you, ask for their advice.
 

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if i can cut out the splits/cracks and re-glue, i do that. If i can't, i stabilize the board by getting glue into the split and clamping it together. you can used compressed air to blow the glue in - you have to turn the valvle almost closed so you have just a wisper of air. otherwise you blow glue everywhere.
 

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Any filler that won't eventually fall out will not likely take stain. I'd use a dark tinted epoxy to fill them in.
But the chances of them just cracking somewhere else will still be very high, as it's nearly impossible to dry slices like that without them splitting apart.
 

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Forget everything that I advised in my first post. I didn't understand that you were dealing with slices with the pith in them. Any of those that have not spit yet will. It's the nature of wood. Anything that you put into those cracks will fall out when the crack opens more.
 
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