My only recommendation for your border idea is to try a small test area to make certain that the surface will accept the adhesive you are using. Many RV's use a vinyl wallcovering that may or may not react well with your particular adhesive and you would have quite a mess if it started peeling in a month or so.
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Jim in Memphis, Wife of 51 years is Brenda
2019 F450 6.7 Powerstroke
2018 Mobile Suites 40RSSA
2021 40' Jayco Eagle
2001 Road king w/matching Harley sidecar
2021 Yamaha X2 Wolverine 1000
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