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Tunnels???
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<P>I also build my own portals. They are too expensive to buy already built. It is not that much of an effort.</P> <P>I use balsa wood to create the forms on a flat surface. I use anywhere fro 1/2 inch to 3/8inch wood strips. I simply pin the wood forms to the surface, pour a rather soupy plaster mix into them and use a metal or plastic straight-edge to level it and let it dry. Do not use a piece of balsa as a straight edge as it will absorb the moisture and not give very smooth results.</P> <P>I made four portals using this method for about $5.00 worth of material vs. $25.00 to $30.00 for four commercial portals. And I have no problems with width, as they are custom made for my needs.</P> <P>I sprayed with concrete paint the same as I would have with the ready made portals.</P>
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