Polyurethane floor with wood look, and related apparatus

A seamless synthetic floor, comprising:

• a substrate;
• a resilient base layer of uniform thickness adhered to the substrate with an adhesive;
• a continuous seal layer formed on top of the base layer across the entire seamless synthetic floor;
• a continuous coating of polyurethane formed on top of the seal layer, the coating of polyurethane having continuous wood-grain markings formed therein, substantially all of the wood-grain markings arranged in a same direction in parallel rows across the entire seamless synthetic floor to create a wood-grain look and a plurality of floorboard lines marked thereon across the entire seamless synthetic floor to create a floorboard look, wherein the wood-grain look and floorboard look together form a wood look mimicking a look of a hardwood floor;
• and
• a clear, continuous sealer topcoat formed on top of the coating of polyurethane across the entire seamless synthetic floor, thereby to seal and protect the wood-grain markings formed in the coating and the floorboard lines marked thereon.