I should mention that I used the "90" mixture (90 minutes working time), and I bought the bag at Home Depot. Now, 3 days later, it is hard, like drywall mud should be, but no shrinking or cracking. The next day, maybe 12-15 hours after I applied it the previous evening, I found it was still a bit soft, soft enough that I could easily scrape some high spots and so forth. And after applying it to my scenery (just filling in some too flat areas between roads and track and such), I sprinkled on some builders sand, just to give it a variety of color/texture. I added a bit of brown concrete color to the mix, to tint it (a little goes a long way!). Worked very well! I got a nice mixture that wasn't "ice cream smooth" as Joe F.
Live and learn - "fine" grade Perlite is needed.īut… I went and dug out a partial bag of fine Vermiculite and tried making Craig's mixture with this, vs Perlite. still had clumps, and some of the crushed stuff still clung together when I mixed it per Craig's recipe. So I put some in a Ziploc bag and hammered away on it with a rubber mallet, trying to reduce it to a finer particulate.ĭidn't work very well. Oops! That would leave my mixture way too lumpy, I thought.
Problem is, the bag arrived labeled as "coarse". I couldn't find any Perlite locally, that was just plain, with no additives, so I ordered a bag via Amazon.
#Difference between drywall plaster and plaster of paris pdf#
I tried Craig Vreeland's method after reading the PDF you provided the link for.
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