An apparatus is disclosed for covering an airless spray gun for the purpose of protecting the gun while preventing unintended triggering. Protecting the gun prolongs the life of the tool while preventing unintended triggering helps prevent injection injuries. In one embodiment a semi-rigid elastomeric form encloses the top, front, bottom and at least a portion of the sides of an airless spray gun, or air assisted spray gun, while a flexible elastomeric material covers a significant portion of the sides of the tool.