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I would focus on the perimeter of the sump's walls first. Then after it has set for about 45 minutes or so, you can glue the baffles to the base. What I do just before I glue the baffles, I take a pin to verify the gap. If it is pretty snug, it's ready to glue. If the pin moves about too easily, I'll take some newspaper sections and place them under that area of the sump, whch pushes the base upwards against the baffles. Now it is ready to glue.
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