a resin - rich peel ply that does not leave behind residual fibers after peeling and can work well with different resin - based composite substrates . the resin - rich peel ply is composed of a woven fabric impregnated with a resin matrix different from the resin matrix of the composite substrate . the peel ply is designed such that , upon manual removal of the peel ply from the composite substrate &# 39 ; s surface , a thin film of the peel ply resin remains on the composite substrate &# 39 ; s surface to create a bondable surface capable of bonding with another composite substrate , but no fibrous material from the woven fabric remains on the same surface .