The Weymann method was limited in the type of curves it could produce and, as W. O. observed, it lacked the shine of a fine paint job. These factors caused the decline in popularity which started in the late 1920s. In 1929 Mr. Weymann introduced the "Semi-Weymann" which was metal-paneled below the beltline and fabric above. Weymann asserted that flexibility was most required around the doors. Later, he admitted that the "Semi-Weymann" had been developed only "to satisfy French demands for shiny surfaces."

By the early 1930s, customers had all but abandoned the Weymann style. Probably the last to be built in Britain was a 1935 3 1/2-litre Bentley saloon by H. J. Mulliner. The style had seen its day.

Relatively few Weymann bodies exist today because, if neglected, the covering went to pot and wood rot followed. However, with reasonable care they would (and did) survive well.