I've been taking care of ours ( 1 STEK Dynoshield, 1 XPEL Fusion ) just like ceramic coated paint. While ours are/were indeed coated at install, I'd take care of the same way if they were bare PPF.
- No wax or 'creamy' products that can build up on/in edges & seams
- No petroleum based products
- If pressure washing, stay away from edges & seams
- Careful washing around edge/seams
- No auto car washes, even touchless (crazy air blowers at end could lift 'loose' PPF)
- Ph neutral washes, spray LSP's
Pretty much treat it like paint w/ an eye towards 'edge discipline'