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I have a store bought Styrofoam tombstone that is one inch thick. I plan to cut a piece of one inch pink foam board to glue on the back to make it thicker and stronger. My question is this. I want to use something on the sides of the tombstone where the Styrofoam and pink foam board meet to both seal it and make it look like it is one piece. What type of material could I use? I'm thinking about something the consistency of spackle or wood putty. What would stick and not crack? Any ideas?
 

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Check out this post I created a while back:
I don't think I ever got around to posting a tutorial but here are the basics:

1. Use construction or foamboard adhesive to laminate the pieces together.
2. I used a mixture of drywall spackle and exterior latex paint applied with a putty knife to the edges and then painted the other surfaces with the same mixture. You could also use Drylok, which is a concrete sealer that has a sandy texture. This will seal the gaps and make it water resistant. (You can see how large and rough my edges are and I didn't do any special sealing or sanding.)
3. You can then finish paint it with any type of paint (spray, acrylic, latex).
 
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