Finally, the last part. Spreading the stuff on is not really an art, but it does help to have a technique.
First off, make sure you are doing this on a surface that can get a bit of gunk on it and it won't matter. I use a piece of unused foamboard that I also use for painting miniatures on. You don't want this stuff getting on your nice kitchen table (I speak from experience)....
Using your large brush, spread on the first coat evenly. It is perfectly okay to put a thick coat on, because with all the glue in the mixture it will be nice and solid when it dries. Due to the black paint you put in, your mixture should be a dark gray color. This makes it easy to see the spots you missed, and serves as a good base-coat. All the white powder and glue lightened up the black, so if you want a totally black basecoat you will have to paint it when it dries. I will cover painting it in the next part.
When you are applying the coat of stuff, pay special attention to the corners and the edges. The plaster helps define the edges and make them look more like ruined rubble. Adding successive layers can help build up more rubble in the corners.
In order for it to harden properly, you should let it dry for at least 10 hours. Or overnight, whichever you prefer. I tend to make this my last project for the day, because I hate to wait for anything. Make sure it is out of reach of kids and pets. Also, the temperature and humidity has an effect on the drying time. I am basing my drying times on 68 F, really dry conditions. Your results may vary.
Next up, Painting the Foamcore Ruins!
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