Cowl repair

I'm doing the right and left side cowl. I had to cut "windows" in the outer cowl, then cut out the areas in the "inner". I'm welding in new "collar" sections. Its a big big crappy job.

Small holes, means the rot is much bigger than the hole. a quick temp fix is to use asphalt roof sealant (from a caulk tube) and seal it from underneath. You'll still have to drop the heater box and vent box to do it.

Once sealed from underneath; make sure you clean out the cowl as much as possible with compress air, vacuum and whatever else you can think of. You can then pour some gastank sealant into the cowl slits, and hope that seals the topsides of the pinholes. I've never done it, but considered it before doing the big cut job.

good luck. BTW: my work is on a 65. But the only real way to fix it is to cut it out.