An employee mixed epoxy paint and thinner (two-part epoxy) and added it to a pneumatic spray gun before entering a negative pressure paint booth to paint a pump. The employee wore safety glasses, gloves, and a half-mask respirator before entering the paint booth. Within 10 minutes of removing the respirator and cleaning the gun, the employee began itching due to a suspected allergic reaction to the paint. The employee was hospitalized for a possible heart attack.