Method and apparatus for spraying truck bed liners

A portable system for spraying viscous coating material having a viscosity of about 700-2000 centipoise onto a surface, comprising:

• a portable cart having an enclosed interior;
• an electrically powered heater in communication with a temperature sensor to regulate the temperature of the enclosed interior,
• temperature controlled containers for the coating materials including at least one container for an activator and one container for a resin each of which are enclosed sufficiently in the interior of the cart so the heater can maintain the temperature of the coating materials in the containers at a predetermined minimum temperature during use of the system, the containers containing a resin and activator selected to cure in less than about 10 seconds after the resin and activator are mixed;
• a high volume, low pressure air compressor mounted on the cart for providing compressed air to the spray through air lines placed in fluid communication with means for spraying mixed coating materials, said means comprising an external mixture of air from the compressor with viscous coating material from the containers;
• and
• at least one pump in fluid communication with the containers and a static mixing tube in fluid communication with the means for spraying to pump the resin and activator to the means for spraying during use of the system, the system being configured to spray a mixture of resin and activator having a cure time of less than about 10 seconds.

A method for spraying coating materials onto a surface, comprising:

• providing plural coating components to a static mixing tube without mixing at least two of the components which include a resin and an activator, by pumping the components from temperature controlled tanks through separate material lines to the mixing tube;
• partially mixing the activator and resin in the mixing tube by using one of a tube length, tube diameter, or fewer than the number of static mixing elements needed to thoroughly mix the activator and resin within the tub in order to delay curing of the partially mixed materials;
• providing the partially mixed materials to an external air-mixture spray nozzle at a predetermined rate by using pumps;
• providing high volume, low pressure air at below about 100 psi to the external air-mixture spray nozzle to spray the material onto the surface to be coated.

A portable system for spraying viscous coating material, comprising:

• a portable cart having an enclosed interior;
• a heater providing heat to the enclosed interior,
• containers for holding at least two coating materials during use of the system, at least one of the containers having a major portion enclosed within the interior of the cart;
• at least one high volume, low pressure air compressor mounted on the cart;
• a spray gun in fluid communication with the containers and air compressor, the spray gun having a spray nozzle providing mixture of air from the compressor with coating material from the containers, the spray gun having a static mixing tube within which coating materials are mixed prior to being sprayed by the nozzle, the static mixing tube having the number of static mixing elements selected to cause partial mixing of the coating materials to delay curing of the partially mixed coating materials;
• and
• at least one pump in fluid communication with the containers and static mixing tube to pump coating material from at least two of the containers to the spray gun during use of the system.

A portable system for spraying viscous coating material having a viscosity of about 700-2000 centipoise, comprising:

• a portable cart having an enclosed interior;
• a heater providing heat to the enclosed interior,
• containers for holding at least two coating materials during use of the system, at least one of the containers having a major portion enclosed within the interior of the cart;
• at least one high volume, low pressure air compressor mounted on the cart;
• a spray gun in fluid communication with the containers and air compressor, the spray gun having a spray nozzle for providing a mixture of air from the compressor with viscous coating material from the containers, the spray gun having a static mixing tube within which the viscous coating materials are mixed prior to being sprayed by the nozzle;
• and
• at least one pump in fluid communication with the containers and static mixing tube to pump the viscous coating material from at least two of the containers to the spray gun during use of the system wherein the static mixing tube has static mixing elements extending about ½ or less of the length of the static mixing tube.

A portable system for spraying viscous coating material having a viscosity of about 700-2000 centipoise, comprising:

• a portable cart having an enclosed interior;
• a heater providing heat to the enclosed interior,
• containers for holding at least two coating materials during use of the system, at least one of the containers having a major portion enclosed within the interior of the cart;
• at least one high volume, low pressure air compressor mounted on the cart;
• a spray gun in fluid communication with the containers and air compressor, the spray gun having a spray nozzle for providing a mixture of air from the compressor with viscous coating material from the containers, the spray gun having a static mixing tube within which the viscous coating materials are mixed prior to being sprayed by the nozzle;
• and
• at least one pump in fluid communication with the containers and static mixing tube to pump the viscous coating material from at least two of the containers to the spray gun during use of the system wherein the static mixing tube has the number of static mixing elements elected to cause partial mixing of the coating materials to delay curing of the partially mixed coating materials.