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A damaged object or a decorative pattern to reproduce? Adopt the mold technique, latex or silicone paste. It's easy and fun!

Molding in all its forms

Latex

Latex

Flexible, latex (rubber) is a quick and easy way to faithfully reproduce the most complex patterns. The imprint obtained may receive molding plaster or a polyester resin. The demolding is carried out without problem in both cases.
Demonstration via the repair of a very damaged old frame.

Molding in all its forms: rubber

Dust with a moist cotton swab the least damaged part of the frame.
Clog up any crackings with putty.
Sand after curing.
Recoat (if necessary) unstable elements with vinyl wood glue.

Molding in all its forms: molding

Cut out strips of modeling clay with the cutter.
Flatten them with a rolling pin and use them to make a well-sealed formwork (provide reinforcements to prevent sagging under the pressure of the liquid rubber).

Molding in all its forms: forms

Mix the rubber and catalyst in a bowl according to the manufacturer's instructions.
Pour the liquid into the formwork (avoid air bubbles).
As the soft rubber is self-releasing, you do not need a release agent.

Molding in all its forms: molding

Remove the modeling clay from the formwork after 24 hours.
Remove the rubber footprint.
Load this model of modeling plaster.
Apply a layer of "creamy" plaster on the damaged part to glue the new decor.

Molding in all its forms: paste

Resume the decor with a painter's knife and sandpaper to soften the contours.
Fill the gaps with a filling compound and sand.
After drying (about a week), switch to coloring.

Equipment

Putty putty
Vinyl wood glue (exterior quality)
Plasticine (Plastiline)
Silicone rubber + catalyst (supplied with the can)
Rolling pin
Abrasive paper
Cutter
Painter's knife

Silicone paste

Silicone paste

The silicone paste is in the form of two components to be mixed at the time of use. It allows to make flexible molds. With a high fidelity in its capacity to marry the finest contours, this paste does not flow and allows to work in any position.

Molding in all its forms: rubber

Mix the two components of the silicone paste equally (one is white and the other is blue).
Take the necessary amount and intimately mix the two products until you get a single color.

Molding in all its forms: forms

Apply the paste to the finger, without delay, on the part or parts of the pattern whose imprint will be used.
After 15 minutes, remove the mold.

Molding in all its forms: paste

Mark in pencil (or felt) the direction in which the mold must appear on the object.
Fill the mold with polyester putty (adding a small amount of hardener) without putting too much (at the risk of sanding) or not enough (missing fill).

Molding in all its forms: paste

Apply a thin layer of putty, with a knife, on the break (to promote adhesion) and put the silicone mold with its contents.
Use the markers previously drawn to position the mold.

Molding in all its forms: mold

Let the putty harden.
Unmould after 1/4 hour and sand.
Use an abrasive grain of 120, then 160 and 200. Finish with an extra fine grain of 400.

Molding in all its forms: mold

Paint the repaired part with oil paint and blur with pencil.

Equipment

Two-component silicone paste
Polyester + hardener putty (supplied with the sealant)
Abrasives (grains 120, 160, 200, 400)
Pencil or felt
Oil painting (of the color of the object)
Brush
Painter's knife
Pencil to fade


Video Instruction: Injection Molding Animation