sample remains prone to beading after spinning and before final curing if done too late comets streaks and other imperfections are produced due to the formation of gels one embodiment of this invention is a process for preparing a organosilicon polymer of balanced stoichiometry that can be used in applications such as spin coating this process comprises a forming a pre polymer by reacting an unbalanced stoichiometric mixture of a first monomer comprising two or more si u2014 h groups and a second monomer comprising two or more si alkenyl groups in the presence of a hydrosilation catalyst and b reacting the pre polymer with additional monomer to form a polymer of balanced stoichiometry suitable first monomers include 2 4 6 8 tetramethylcyclotetrasiloxane 1 1 3 3 5 5 hexamethyltrisiloxane 1 1 3 3 5 5 7 7 octamethyltetrasiloxane pentamethylcyclopentasiloxane trimethylcyclotrisiloxane tetrakis dimethylsiloxy silane phenyltris dimethylsiloxy silane methyltris dimethylsiloxy silane tetraethylcyclotetrasiloxane 1 1 3 3 tetramethyldimethylsiloxane 1 1 3 3 tetraisopropyldisiloxane 1 4 bis dimethylsilyl benzene 1 1 4 4 tetramethyldisilethylene 1 3 diphenyl 1 3 dimethyldisiloxane bis p dimethylsilyl phenyl ether 4 4 u2032 bis dimethylsilyl biphenyl 2 6 bis dimethylsilyl naphthalene suitable second monomers include vinyl compounds such as 1 3 5 trivinyl.