Three years unopened and six months after opening. No, it will damage the majority of plastic surfaces. If using indoors open all windows and doors and maintain a cross ventilation of moving fresh air across the work area. The work area and tools can be cleaned up with soap and water. Shake well and open can slowly to relieve pressure. Cannot be made non-poisonous. I had a rental property and the tenants had gotten paint in my stainless steel sink.
I tried everything or so I thought to get it out, but wasn't able to.
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Whenever possible use outdoors in an open air area. I had scrubbed before until I thought my arm would fall off. Do not mix with any other product. If using indoors open all windows and doors and maintain a cross ventilation of moving fresh air across the work area. It worked amazingly well. Well I was at Lowe's and saw this product and decided to try it.