  Abundance analyses are presented and discussed for eight RV Tauri variables.
The RV B star UY Ara shows the abundance anomalies seen in other RV B stars,
namely elements that condense into grains at high temperature are underabundant
but elements of low condensation temperature are much less underabundant. This
pattern is ascribed to a separation of dust from gas with accretion of gas but
not dust by the atmosphere. Abundances for two RV C stars with earlier results
for other RV C stars show that these intrinsically metal-poor stars do not show
effects of dust-gas separation. Analyses of five RV A stars show that these
cooler stars are very largely unaffected by dust-gas separation. It is proposed
that the deeper convective envelope of cooler stars dilutes anomalies resulting
from dust-gas separation - the dusty wind off the RV Tauri variable or a dusty
circumbinary disk - are reviewed and observational tests are suggested.
