DIFFERENT RESINS FOR DIFFERENT USES

I use different resins for different purposes.  While yes, it is quite possible to make fully functional figures from one particular resin, here are some of the reasons why I use multiple resins.

I don't like painting.  So for parts where I use tinting or dyes, I use color accepting resins.  Resin color depends a lot on the resin you use,  For example, white resin requires a lot of dye to achieve the desired color because you have to 'overcome' the white.  If you use an insufficient amount of dye, you get a pastel color.  Pink instead of red.

Articulation for mating parts where practical.  This is actually quite important.  While it hasn't been an issue so far, it is best to use different resins for mating parts that articulate.  If the material of a peg is identical to the material surrounding the hole it goes into, the similarities of both could contribute to the peg essentially welding itself into the hole.  In industry, pins are never the same material for that exact reason.  One is usually softer metal to prevent this.  Its why Homeworld has recently changed to  urethane arm pins and a different resin for the torso.

Some resins have longer or shorter pot life.  I vary between each depending on how many molds or how intricate a mold is.  If Im pouring a lot, I use longer pot life resins.

Some resins are harder when cured than others.  But the harder they are, the more brittle they become. 

Some resins can handle higher heat temperatures than others like the black onyx.

And then there are resins that handle paint better than others.

Before you buy your resin, talk to your local retailer and discuss your project and needs with him to help you select the resin that is best for your project.