aft hatch - Starboard side

[MM33]

I am making my form out of MDf that is backed by a smooth piece of maeline. I have one question though, the inside edges of the form will be MDF, which is kind of porous once you cut it. Before I put the mold release down do I have to put something over those porous edges? I am also going to make an edge using sculpting clay, does that get coated with mold release too? Does the clay dry?