Gulff resins dry 100% tack-free and cure in just seconds. The "Classic" is a medium viscosity resin, the "Fatman" is a thick viscosity resin, and the "Flexman" is a flexible resin (surprise surprise). They are biodegradable, do not contain products listed as carcinogens (yippee), do not include any substances known to be marine pollutants according to IMDG code, and do not include any environmentally hazardous substances according to ADN. In short, they are much less toxic than other UV resins!