Silicone will not work the best on MDF. Actually get Woodworking glue as noted above, titebond is one brand. You can thin this and paint it on the cut surface to really harden it. And it seals the MDF quite well once you are finished. Makes it easier to paint without the edges soaking up three or 4 coats. Spray shellac is quicker to seal… But won’t work as well.
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