The invention is directed to controlling sand production in an oil and/or gas well. A preferred embodiment of the invention is directed to repairing a downhole screen by pumping neutrally buoyant resin coated material into a damaged portion of a gravel pack screen and also into any void behind the damaged portion of the screen. The neutrally buoyant resin provides for the repair of a portion of the screen even if the damaged portion is located on the uphole side of a deviated well. Any excess resin coated material may subsequently be removed from the central passageway of the screen and then circulated to the surface because the resin coated material is neutrally buoyant. Neutrally buoyant resin may be pumped into a well that does not have a sand control system. The porous neutrally buoyant resin allows production of hydrocarbons, but prevents production of sand into the well.