Thanks David. I had a different one linked. The one i linked was the one Tyler Garrard (RaceMechaniX) suggest in another (old) topic (
https://www.intlwaters.com/threads/receiver-for-4px.78979/#post-769404).
I had a look at the MG chemicals website (
https://mgchemicals.com/category/conformal-coating/silicone-conformal-coatings/) and there are 2 types of coating where they both suggest to be used for RC (see snapshots below), the one you are using and the one from Tyler. The Silicone CC looks to be even tougher then the Acrylic one you are using.
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When you apply it, you only cover the servo connector pins? I want to use it on some new Futaba 603FS receivers. Do you need to cover the bind button and antenna connector?