832WC Water Clear Epoxy

https://www.mgchemicals.com/products/potting-compounds/epoxy-potting/clear-epoxy-resin/

832WC is a rigid, 2-part, clear epoxy resin that offers extreme environmental, mechanical and physical protection for printed circuit boards and electronic assemblies. This product is designed for applications where high clarity is required. It does not yellow when exposed to UV light; it maintains clarity in applications with service temperatures of up to 65 °C (149 °F) and intermittent exposures of up to 100 °C (212 °F). It can be used for underwater applications such as swimming pool light potting compound. It is also a good choice for casting resin.

Features & Benefits
Optically clear potting compound (can be used as a casting epoxy resin)
UV light stable (minimal yellowing)
Very low mixed viscosity of 980 cP
Convenient 2A:1B volume mix ratio
Excellent electrical insulating characteristics
Extremely high compressive and tensile strength
Good adhesion to a wide variety of substrates, including metals, composites, glass, ceramics, and many plastics
Broad service temperature range of -40 to 140 °C (-40 to 284 °F)
Extreme resistance to water and humidity (allows for submersion where needed)
Solvent-free