3D MODELING FOR ODM SPA MOULD - using advanced computer assisted design (CAD) and 3D modeling, we created the formfitting seats that perfectly accommodate the body; CRAFTED BY HAND, FROM SCRATCH, MOLDED TO PERFECTION - every hot tub spa mould is sculpted by hand, to achieve the smoothness and feel of every contour of the spa that no machine can deliver. This sculpting process can take months to perfect. gel-coast on mould surface- highly resistant to high temperature, and it features smooth surface finish and texture, and exceptional durability; great mechanical properties, great gloss, and heat resistance and flexibility to the final mould; the shells thermoformed from our mould come with superb smooth surface finish. high quality fiberglass mat- soft and more penetrative, more strength bonding resin- professional specialty resin features perfect bonding capability, high-temperature resistant used for 3000 times thermo-formingunder proper care and maintenance