Polychem 7478-X-75 Phenolic alkyd resin OPC Polymers Alkyd Resins xylene Polychem 7478-X-75 POLYCHEM 7478 is a phenolic modified alkyd supplied at 75% solids in xylene. Excellent choice for specialty coatings, especially non-lifting primers. Industrial primers Linseed: Tofa: Tung Air dry Air drying, phenolic modified linseed/tofa/tung alkyd resin. Used for specialty coatings especially non-lifting primers.