not really, the headliner is attached using adhesives, madalas nasisira ang adhesive pag nababasa, that's why most DIY products are foamy... Pag nasira yung adhesive the headliner can droop down and collapse...

as long as the headliner isn't soaked or too dampened with liquid, it should be ok, but it's still best to avoid wetting the headliner... (unless vinyl lang sya, in that case, it's more tolerant to moisture)