Absolutely the Pastelub!!!!!!!!! I tried the Ceramlub one time on enclosed pins and it dried out, seizing the pins. I believe the OEM company from Switzerland also labeled the ceramlub for Bendix. Others have reported o.k. results with it. I did not try it on exposed parts.
I can't say enough about the Pastelub. Try a dab of Pastelub under a faucet and water absolutely refuses to mix into it. Besides the exposed metal caliper parts, I use a paper thin coating on rotor hats, hubs, and anywhere else I wish to prevent rust. I also use it on agriculture applications such as exposed gate hinges. It is simply awesome stuff and a tub will last for many years. I imagine it is similar to Molykote 77, but is pao based (I think) vs. the Dow product being silicone.
I buy the Tub at Goodsons. https://goodson.com/products/bpl-2400-pastelub-brake-lubricant
OEM website: https://www.igralub.us/igralub/index.php?id=557
Buy it with confidence for exposed to weather metal-to-metal applications. I'll see if I can find some pics. (First pic not mine)