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So I've been building my cave gutter background. I've used vinyl gutters, ge 1 silicone window and door, black gravel and zip ties. So I'm looking to just touch up small interior holes I cut into the gutters, the inside is white and outside is brown with black gravel. What would be safe to use? It's too hard to try and get little gravel silicone in there, there's not enough surface to keep in on. Any type of marker or paint I could use? Any help would be great