Spex•Crete™ 350 Super Set is a just add water, Ultra Lightweight Underlayment designed for deep fill flooring applications where set time is critical. Spex•Crete™ 350 SS has a 35% improvement on initial set time compared to Spex•Crete™ 350 ULU and provides a weight savings of ~69% as compared to traditional underlayments. This gives you the competitive advantage for your commercial lightweight concrete projects. Used as a deep fill replacement for EPS board, Spex•Crete™ 350 SS can easily be pumped and finished, saving both time and money on your next job.