I need help changing properties on a union part

Is it possible to change the properties (such as color) on a union part?

I was working on a game where you fight other players in a building. However, I stumbled across a problem where when you unioned a negate part, you can’t change the color.

Usually how I fixed this problem was redoing the walls and coloring them before negate and union, but is there a way where I can color unioned parts?

I’m trying to change the color of the unioned walls without having to restart.
The issue is that once I union the walls with a negate part, I can’t change the color.
Restarting and redoing the parts’ properties before unioning. I checked Roblox Wiki but it hasn’t given me any good tips so far.

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Turn on the UsePartColor Property in the Union’s Properties tab

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