The effect of initiator [I] and monomer [M] concentration on the molecular weight and molecular weight distribution in behenyl acrylate polymerization is presented. Gel formation was observed at high [I] and [M]. The effect of solvents in the polymerization of behenyl, octadecyl and butyl acrylates is discussed. The gel effect is prominent in non-polar solvents and in solvents with lower transfer constants. The viscosity of the reaction medium appears to control the polymerization rate and molecular weight distribution.