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I agree with Robert Knapp! Great Stuff expanding foam works wonders with cracks and gaps. It comes in three consistences depanding on the size of the crack. I started using it because Dave Frary used it on his Cactus Valley RR, the model I'm using for my own RR. It's a little stinky, and you have to becareful not to put too much ont the crack. It does expand quite a bit. You can then trim and shape it using a sharp knife. <br /> <br />Trevor[:)]
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