Old felt roof has corrugated metal overlay so sealed all round. Condensation forming on underside drips on old felt which leaks a bit. I need to gain access through holes either end and spray loads of pour-on (very liquid) sealer so it floods the surface and hopefully finds the cracks. So I need a sprayer with a reasonably long shaft to poke in and let rip. Any sealer and sprayer combinations out there to do this? PS option to remove any part of the corrugated structure not possible. Thanks.
