Perfecting Plaster

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Contents
Flat Floors

How to keep floors flat when using plaster blocks.

Flat Walls

How to keep walls straight using plaster blocks.

Round Walls

How to make neat round towers using plaster blocks.

   

Making Flat Floors (Click thumbnails for larger images)

 

Materials

Glass sheet (either a glass worktop saver or a glass bathroom shelf is ideal, since they are made from safety glass)

The backing can be easily removed from a cheap worktop saver after dishwashing on a hot setting.

Step 1

Make a dry layout the floor design on a suitable board.

Step 2

Place the glass sheet on top and carefully turn the whole lot upside down.

Step 3

The reason for using this method becomes obvious, since the tiles look almost identical from beneath.

Step 4

Put together some lego blocks to use as a set square, and glue the tiles together. Use the glue sparingly, and try to keep it on the upper edge of the tiles to prevent it seeping down onto the front faces.

Step 5

Hold up the glass sheet and look from underneath to check that the pattern is correct. Once dry, the upper surface of the floor should be dead level, although protruding blocks on the underside may need to be sanded before gluing it to a base.

Example

The floor part-way through the painting process.

       

Buildings with Flat Walls (Images to follow)

 

Materials and Equipment

Flat work surface - a glass worktop saver is ideal

Lego to keep blocks square

Clamps

Blocks

PVA (white glue)

 

Step 1

Make a strip of Lego blocks as long as your wall and clamp to one edge of your board. Make 2 "L" shapes from Lego to act as set-squares.

 

Step 2

Lay out your wall blocks dry (without gluing). If you have any variation in size, try to select blocks so as to minimize any unevenness. Build the wall upside-down, with the top against the Lego straight-edge.

 

Step 3

Place packing blocks in any spaces like window or door openings. I usually leave the untextured side facing upward to remind me not to glue these, but you could mark them with a blob of paint.

 

Step 4

Create finger joints at each end of the wall and add packers in the spaces.

 

Step 5

Build the wall upside-down, with the top against the Lego straight-edge. Glue the blocks together with PVA, taking care not to glue the packers. Use the Lego set-squares to keep the ends perpendicular. Leave to dry for an hour or so.

 

Step 6

Whilst the first wall dries, you can begin to dry-stack the blocks for the other walls on another board.

 

Step 7

When dry, carefully remove the packing from the finger joints of the first wall. Set the blocks of the second wall beside the first, and change the blocks for the second finger-joints if the fit is too slack or too tight.

 

Step 8

Glue these blocks in place ensuring you do not glue the two walls together. Use a set-square once again to ensure the end is perpendicular.

 

Step 9

Add the third wall at the other side of the first, dry wall. Leave the new sections to dry for an hour or so.

 

Step 10

Mark the joints then carefully separate the three walls at the joints. Now put the two side walls on the board with the unmarked ends closest, and stack the blocks for the final wall between them.

 

Step 11

Glue the final wall and leave everything to dry for several hours - preferably overnight.

 

Step 12

Stand the wall on its upper face. Slightly separate the joints, and carefully twist the side walls into rough position.

 

Step 13

Slide the final wall into position, add glue and close up all the joints. Use the Lego blocks once again to ensure the corners are square.

 

Step 14

If the new building is a section of a larger structure, set the finished section in position on the existing model to ensure all the walls align nicely. Allow the glue in the joints to dry.

 

Step 15

Once the joints are thoroughly dry, you can sand the bottom edge of the new piece if needed.

       

Buildings with Round Walls (Images to follow)

 

Materials and Equipment

Flat work surface - a glass worktop saver is ideal

Former (see Step 1)

Elastic Bands

Blocks

PVA (white glue)

 

Step 1

To make circular towers, you need some kind of former to build the blocks around. Food and drink tins and bottles can be a good starting point for these, and you can wrap card and tape around them till you get a former with the right diameter.

 

Step 2

I think the easiest way to keep this kind of model neat and square is to split it into a series of layers. I make rings of two or three courses of blocks around a former and leave them to set before continuing. This way you can easily add internal details like stairs before gluing the sections together.

 

Step 3

Lay out your wall blocks dry (without gluing). If you have any variation in size, try to select blocks so as to minimize any unevenness. Build the wall upside-down, with the top against the work board.

 

Step 4

Place packing blocks in any spaces like window or door openings. I usually leave the untextured side facing upward to remind me not to glue these, but you could mark them with a blob of paint.

 

Step 5

Glue each layer together and place an elastic band around it to hold everything in place. Allow the glue to dry for an hour or so.

 

 

Step 6

Remove the elastic bands first, then slide the completed section off the former. For all layers after the first, place the section in situ on the previous piece to ensure that everything lines up correctly. Leave overnight before continuing.

 

Step 7

Add any internal details to the rings - stairs, floors, decorations etc. and leave to dry. Once again, leave the sections upside-down so that the upper surface is nice and flat.

 

Step 8

If you will be able to see the inside of the model, paint the inside of each ring now, whilst it is easy to access.

Leave to dry.

 

Step 9

Before gluing the sections together, dry-stack them. If needed, you can now sand the bottom of any ring which doesn't fit nicely.

 

Step 10

Glue the sections together and leave to dry. If you have parapets or other features which stick out from the building, add them at this stage.

 

Step 11

Paint the exterior.

 

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