Battery Cell Resin Sheet Cover?

Building a milk crate/work box solar generator with 280Ah cells. What can I use to cover the top of the completed cells to protect the terminals and bus bars from contact? When Will Prowse rips apart batteries for review, there is usually some sort of resin insulator sheet. What am I searching for and where do I get them? Or what are other people doing to cover and insulate their cells from other elements? Thank you.

Steve_S said:

LiFePO4 Cell Separator Material

What can I use to separate my LFP Cells and/or line my metal box with to protect my cells ? There are many creative solutions and yet some are downright dangerous (incorrect material for task). The "PROPER" Material for such an application is Epoxied Fiberglass Sheets, specifically, FR-4...

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That was most helpful, thank you!