From Rogers own fabrication note for RO3000:
.."
Most final finishes (HASL, Sn, Ag, Ni/Au, OSP, etc...) have been applied to RO3000 materials without issue or
special concern. A rinse/bake regimen, if not done as part of a solder mask process, should be done prior to
HASL or refl ow exposures. When flux is needed, acid fluxes are recommended over solvent fluxes. The HASL
or reflow exposure should be performed as soon as possible after the flux has been applied. ENIG should be
considered for higher Er materials, especially RO3010 laminate, only when necessary. Background plating of
etched substrate surfaces can occur during ENIG plating.
"..
http://www.rogerscorp.com/documents/634/acs/Fabrication-Guidelines-for-RO3000-and-RO3200-Series-High-Frequency-Circuit-Materials.pdfHope that helps..