Pin hole or surface porosity Pin hole or surface porosity goyo0812 (Aerospace) (OP) 8 Jul 15 11:36 I am wondering how to create pin holes on surface of composite(in other words surface porosity) under peel ply and to solve this problems Could you help me? RE: Pin hole or surface porosity blakmax (Aeronautics) 8 Jul 15 12:37 Expose your pre=preg or film adhesive to high humidity prior to elevated temperature cure. To control it, see Davis, M.J. , Managing Micro-Voiding of Adhesive Bonds, http://www.adhesionassociates.com/papers/Managing%... Regards Blakmax RE: Pin hole or surface porosity goyo0812 (Aerospace) (OP) 8 Jul 15 13:51 hello blakman !! Thank you very much for your valuable information. i realized there were one TYPO in my original question. i fixed the TYPO from adhesive film to peel ply RE: Pin hole or surface porosity Compositepro (Chemical) 8 Jul 15 22:52 You don't provide very much detail. Are you using prepregs and wet peel-ply? Is the pitting in the fabric weave openings, or are you working with uni-tape. Your problem could be air entrapment, excessive resin bleed, too high a volatile content, excessive resin bleed, and/or wrong cure cycle/bagging procedure.