Sand the Wenge wood surface, in the direction of the grain until you get a smooth surface. Fill all pits and pores using wood putty, to create a smooth surface allowing the putty for becoming dry. Sand the putty so that the surface becomes smooth.
Apply a coating of wood sealant on the total surface of the wood. This helps in preventing the seeping of paint in the wood grain. The sealant is allowed to become dry before moving to next step.
Paint the wood with a layer of primer if you desire to obscure the patterns of grain on the wood fully. The primer is allowed to become dry. Another layer of primer should be added if you find that the grain is still showing. The primer is allowed to become fully dry before you move on to the next step. Paint the wood using the desired paint color.