Durable moulage
R/r 911, you mentioned spending a couple of hours on a moulage that would be destroyed right away. This used to be a problem for me too. I still do a lot of wax buildups, creme makeup wheels, and other traditional moulage, especially for one-shot deals that I expect to be destroyed. There are some new things on the market that can last all day and be touched, splinted, bandaged, over and over and still look good. Several companies make two-part silicone that comes in flesh and blood colors. You simply mix the two parts together into a thick paste that is applied to the skin much like you would Dermawax or other traditional products. You can sculpt it with a popsicle stick or other tool into any shape cut or whatever. It cures in just 10 minutes to a soft fleshy rubber and will stick all day. You then add your blood with the same material in red and you have a wound that will last through numerous bandagings. There are also alcohol activated makeups that come in palettes like water colors, but which are reactivated by a brush dipped in alcohol. You can stipple, brush, or even drip it on. Once it's dry it is waterproof and stays put for hours.
Here is one that I did for a recent class. This young lady had deep abrasions to her face and hands. The entire makeup was done in about 20 minutes, including curing and drying. During curing time for the silicone, I applied a sucking chest wound/knife stab to another victim. So both moulages took a total of 30 minutes. They lasted through several students treating them as if they were real. All I had to do between students is remove any bandaging and apply a little fresh corn syrup based blood.
When you first look at silicone and AA makeup, they seem kind of expensive, but actually I only had about $2-3 into both moulages. When you compare volume to volume, some of the silicones are no more expensive than the Dermawax. I participated in a 60 victim MCI drill last summer and used both wax buildups and silicone. The partcipants were outside in a cold rain for hours. Afterward, the regular moulage was showing a lot of wear and damage but the silicone and AA stuff looked like it had just been applied. I'm also bit on safety and the silicone and AA makeups are hypoallergenic and non-toxic. They also come off easily. The silcone can be gently peeled off and the AA makeup comes of with either alcohol, or makeup remover followed by soap and water. This young lady took about 15 minutes to get cleaned up after the drill.
Here is a 3rd degree burn I did just playing around with leftovers from another project. It's could have used a bit more color, but this was 10 minutes of playing with what was left in the mixing cup. I did a full-hand burn in a similar manner but don't have a good picture.