- Ultra Mix is a rich, extra fine Winterstone formula with increased strength, toughness and bonding properties. Â It is a casting medium ideal for face coats either brushed on or slush cast where the sculptor desires a more refined and highly polishable/burnishable surface, or to achieve a metallic effect with or without the addition of metallic powders (iron, bronze, brass, etc.)
What effects can I create with Ultra Mix?
- Here's just a few examples of effects you can create with Ultra Mix
How much water do I use to make a batch of Ultra Mix?
- Generally it is 1 part water to 3 parts dry mix. Â (Technically 29-36 parts water per 100 parts dry mix by weight or volume.) Â
What is the working time for Ultra Mix?
- Ultra Mix has a pot life of 40-50 minutes.
How much metallic powder can I add to Ultra Mix?
- Added metallic powders should not exceed 1 part metallicÂ (no Aluminum) to 4 parts Ultra Mix to create a metallic effect. Â Together the metallic and ultra mix are considered the dry mix for measurement by volume purposes.
Using Ultra Mix to Achieve a "Metallic" Bronze Effect - Step-by-step instructions
1A. Â Cast sculpture
- Add 1 part Burnt Umber to 4 parts water. Â Use this water to mix into the Ultra Mix dry powder (not necessary to add metallic powder). Â Use this Ultra Mix for the face coat. Â Using the same water, mix with Casting Mix and/or Sculpting Mix for the backup layers until the desired thickness is achieved (using the same coloured water ensures that white will not show through). Â After demolding clean seams/make repairs as required using Ultra Mix and the same water mixture. Â When finished allow sculpture to cure for 3 days
1B. Â Built-up sculpture
- If using Sculpting Mix to build-up a sculpture, build as normal until the last couple of layers utilizing water with 1 part Burnt Umber to 4 parts water. Â Use a thicker mix of Ultra Mix for the final 1 or 2 layers. Â When finished allow sculpture to dry for 3 days.
2. Â Surface patina
- If the Winterstone sculpture was made without integrally pigmenting the Ultra Mix, an optional step to "kill the white" is to apply Antique Amber or other color reactive stain with a brush to the whole sculpture. Â While still wet dab with a sponge to create a mottled/blended effect. Â Allow to dry.
- Mix a surface patina by combining Yellow Ochre and Burnt Umber. Â Dilute this mixture with 4 parts water then apply over sculpture with a brush. Â This pigment will penetrate into the surface and bind with the Winterstone. Â While still damp dab with a sponge to mottle/blend the surface. Â Allow to dry.
- Mix a darker surface patina by adding Raw Umber to the existing diluted patina. Â Apply into recessed areas of the sculpture with a brush. Â This layer will also penetrate into the surface and bind with the Winterstone. Â While still damp dab with a sponge to blend the surface. Â Allow to dry for 24 hours.
- Using aÂ soft bristle brass brushÂ selectively burnish the high spots leaving the depressions and textured areas untouched. Â The following day the sculpture can have another session of burnishing for a more metallic/glossy look. Â