Shop for Stereolithography (SLA) Resins. Stereolithography (SLA) resins are liquid UV-curable photopolymers used in stereolithography which is a rapid manufacturing and rapid prototyping technology. SLA resins replicate the performance parameters of production materials, saving both time and money in new product development. From thermoplastic elastomers to polyethylene, polypropylene, and ABS, our Somos® resins provide solutions for many applications. Stocked products typically ship in 2-5 business days. Can’t find what you need? Get a quote.