Could you have maybe 5 stages of weathering and just fade two stages of textures into each other as time went on for that "continuous change" effect?
Like if you're at weathering 2.7/5 then your boat's texture would be stage 3 weathered texture underneath with the with the stage 2 weathered texture on top at 30% opacity. The result is you'd see the patterns from the stage 3 skin slowly emerge from under the stage 2 skin over time.
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