Solder paste is not hazardous to use. However, it does contains metals and ingredients that you don't want ingested. Here are the following guidelines for using Solder Paste: 1. Do not touch paste with your bare hands 2. Wear protective goggles, gloves, and respirator when handling solder paste (i.e.- solder mask) 3. Keep away from kids! (i.e.- never leave opened tin open where it could be reached by children) 4. Protect work surfaces with Vaseline or petroleum jelly 5. Minimize the amount of time spent around solder paste fumes; use an exhaust ventilator for prolonged periods in confined spaces or near large quantities of particles