A spout fluid bed coating system was designed to coat porous particles in a size range from 0.1 – 2 mm in diameter. The goal of the equipment was to process the particles and to insure that just their outer surface gets coated. The inner surface area of the particles needed to remain open to preserve their functionality. Due to the low density and fragility of the porous particles, it was important to design the coater such that the particles made as little contact with the walls of the coater as possible and that the coating dried before the particles touched either the walls of the equipment or each other. Particle coating for these types of particles has never been attempted and so a finite element package, COMSOL, was used to help design the system and then to simulate the fluid flow within the system. Key elements of the simulation were to determine the flow streamlines for the air, the pressures in the various components of the system, and the particle trajectories. Simulations were initially done in two-dimensions followed by a full three-dimensional simulation. The paper will discuss the details of the design, the simulation, and experimental results we obtained on the actual coating of the particles and their performance following coating. A conventional, pharmaceutical coating, Surelease, from Colorcon, was used as the coating material and the apparatus can be used to coat low density as well as high density materials. It is well suited for many coating applications including those in the pharmaceutical industry.