Karịrị China, ngwaahịa ndị United States na ngwaahịa zuru ụwa ọnụ. Ndị na-enweghị isi Gypsum na-enweghị enyemaka na-enyere aka ịkwanyere onye na-ese ihe okike. Otutu otutu mepụtara nke ọma Gypsum Primer elu nke na-ebudata iche iche na adhesion nke na-abaghị uru ma na-emekwa ka ezigbo pirtionzerming. Ka ihe okike omenka bi na ihe omumu nka.