Sealing the Foam
Now that I have the final shape, I proceeded to seal the foam with drywall spackle. I used the spatula in the photo above to press the spackle into the foam.
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And once everything was covered and dry, I sanded everything down using a disposable nail file / emory board. These are great since there is a coarse and fine side and it thin and flexible to get in between the gap.
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Next I mixed up some spackle with water to create a thinned goop that will help get into the gaps better and spread it across the entire surface to smooth out sections and give the overall look a smoother appearance.
Below is the final spackled piece. I then mixed up some Mod Podge and grey acrylic paint and applied it to the entire surface for a total of two coats.
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Once that dried, everything received another sanding including removing the visible brush strokes. This was then followed by two coats of filler primer and more sanding but gentler than before with 500g and 1000g sandpaper on the exterior surfaces.
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