Heat resistant patches inside a cowling

Thank you, Gentlemen.

As a summary:
– Mooney forum recommended: https://www.aircraftspruce.com/catalog/eppages/kevlarheatshield.php and https://www.aircraftspruce.com/catalog/eppages/alumheatbarrierstops.php as well as Thermo-Tec 13575; the last one seems most cost effective and with the best feedback;
– an alternative people around Europe have used is a aluminium/fibreglass mat with adhesive: https://www.amazon.de/gp/aw/d/B07KJHPRZ8 which seems to be both less expensive than the stuff above, and more readily available in the EU;
– based on the Amazon stuff, I will review what local automotive tuning shops use and may go with that due to availability (the DL-Racing stuff from Amazon takes more than a week to show up in PL), will update next week.

Great points about:
– sealing edges with high temp RTV, eg. Dowsil 736, to prevent oil/dirt ingress (A_and_C);
– that the material / adhesive doesn’t need to be space-shuttle rated (Peter, who I hopefully paraphrased closely enough).

That the cowling needs to be prepared properly for the adhesive to bond properly goes without saying.

Vans Aircraft uses some kind of self-adhesive aluminium foil. I’ve got some leftovers from my RV14 build, and would be happy to make those available for you if you can make it to EPZR

@RV14, thanks for your most generous offer – I’ll be thrilled to make my way to Żar, or to meet up somewhere, just to see your RV; failing that I might as some glider pilots from AK to pick it up for me; I’ll be in touch.

Would it not be more effective to put heat shields on the exhaust system? Not sure if you have the room or can do this on a certified aircraft – it’s what I did on my RV-8 to deal with a “hot” cowl.

I doubt any real heat shield on the pipes would fit; the original Mooney solution is a bit of a heat shield sheet material stuck on to the cowling; this has deteriorated and I am looking to renew / replace it.

Would heat shield on the exhaust heat up until it was radiating/convecting the heat being produced?

Peter wrote:

(courier works to the EU; it is only airmail / small packet which is affected by the “UK packet rearguard action” of some EU customs offices).

I sent 3 small PCBs to Spain last year by airmail – packet about 120mm x 80mm x 40mm, took over a month!