Introduction to Building Plaster Kits

By Clark Kooning, MMR CRC





Plaster kits offer some great alternatives to the plastic structures and even some laser kits. Nothing looks like brick or plaster…like plaster. They're easy to put together and work with, however they are less forgiving and the castings are FRAGILE. So take care in handling your castings and try to keep them flat as you prep them.



Generally Steps in Building Plaster kits


  1. Prepping your castings is one of the most important steps in the whole assembly of your kit.
  2. Remove your kit castings and lay them out on a flat surface…..Glass is great for this
  3. If any castings are broken, don’t try to fix 'em up or sand/grind or square up any part… just put them back together with the pieces you have.
  4. You can glue the parts back together with YELLOW Glue or white glue or 5 min epoxy or super glue
  5. .If you have never done this wait...!!! Till part 2 and I will show you....!!!!Once parts are dry you can add a slurry of plaster to fill in the missing plaster ..



  1. Clean up all the plaster castings by removing any extra flash or casting lines, make sure it is a casting line and not a detail before you remove it from a casting.
  2. Clean and check door and window openings for excess flash.
  3. Clean up plastic windows and doors of any flash.
  4. Test fit doors and windows into casting doors and window spacing’s…..DO NOT FORCE!!!!
  5. Scrape or sand away plaster till plastic item fits, again with out forcing them in to the openings.
  6. Sand the bottoms and edges of the casting and any places where the walls join, do not over sand and always keep a square edge. Some castings have an angle on the wall edges….for angled walls…be mindful of this and check your kits layout and instructions as this angle may be required.



  1. Sealing castings, is a very important part of the casting preparation, there are several theory’s on this process and many ideas. There are as many ideas and theory’s on when to do this as well.  My idea and one you may choose or not to follow is to seal the casting after the first clean up I seal the casting on all sides’ front back and all edges, particular attention to openings with a clear matt finish. I use Krylon Matte Finish you can use Testors dull coat too, but the Krylon is cheaper by far. Use only a very light spray on the casting for a first seal
  2. I then check the fit off all parts walls to walls etc…
  3. If they do not fit well or have “parts” or chips in plaster do not seal further.
  4. If you have a tight fit between walls you may spray the casting again ensuring the casting are seal very well, when dry they should have a slight slippery feel to them.
  5. You can assembly the walls by gluing them together, again, I like to use Yellow glue, keep the glue to the back edge of the casting so the excess does not come out on the detail of the walls.
  6. Make a "L" out of the walls checking the square of each.
  7. Once the "L"'s are dry glue both "L"'s together making sure they are square.
  8. Wipe any excess glue off ASAP with a damp clean cloth.
  9. Let dry.


Wait for Part#2