Pigmented resin cast

Trying out a polyurethane pigment to colour resin casts.I got this one fron Tiranti.Its black and I wanted the casts to come out grey but looks like I added too much pigment (think I added about 2%).Probably need less than 1% of pigment to resin.

New silicone rubber

Trying out a new silicone rubber from DWR plastics
RTV Silicone Moulding Rubber 6.18kg kit
Shore Hardness: A 28 *Medium*, Catalyst : Purple,
Cheapest silicone rubber I have bought yet-cheaper than Tiranti and Tomps.Seems good.One thing I did not like about Tomps was the blue catalyst turned whatever you were casting blue too.This one doesn't.Its a pale purple catalyst that doesn't leach any colour on to your castings.
I made a waste mould using it for Ian...

Took the soft Chavant as far as I could and made a TMS wax cast from it and started refining...

The Lizard-painted

The Lizard

Finally finished the lizard. This is the resin cast primed.

The original was sculpted in homemade zen wax (grey) and homemade '360' wax (pink).

This is the first time I have used a different moulding process.It takes longer than my previous method (see Iron Man) but I think the extra effort is worth it because I was fed up with mis-alignment with casts and this method eliminates that problem.This is also the first time I have used 'keys' (the male and female parts that allow the pieces to register and lock together) Here are pics to show the moulding process

 First cut up the sculpture.And add the 'keys'

 Start to mould the tail.

 Starting to build up the first half using chavant NSP (medium)

 Finished with the chavant.

 Adding the all important registration marks that will ensure the two halves of the mould will lock together perfectly with no mis-alignment.I just used the end of a paintbrush and press it into the chavant.

 Pour the first half of silicone.

 Once the silicone is cured, I can begin to create the second half of the mould.

 Remove all the chavant and clean any remaining clay from the sculpture and silicone.Build the lego bricks back up.Brush vaseline onto the sculpture and most importantly onto the first half of the silicone mould.This is to ensure the second half of silicone will not adhere to the first half.You can use spray on mould release but a liberal brushing of vaseline is the failsafe.

 The two halves should come apart with no problem.Remove any remaining bits of the sculpture.

The resin cast will only need a simple seam line clean up.
Here are a few more moulding process pics.I ran out of the Tiranti silicone but had the Tomps silicone on hand ( the blue one).

Sir Ian

A little break from the Lizard sculpture to do a quick sketch of  Sir Ian Mckellan.Its a chavant clay but I don't know which one! Its pretty soft anyway. I have never tried to do a portrait likeness sculpture before so I wanted to see if I could capture the likeness with just a quick sketch.Used a couple of photo's front view and profile. A bit of measuring but mostly by eye.Pleased with it but the real test is to try a less 'characterful' face and still make it look like the person.