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Matte Medium or PVA?
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I,ve tried both. Myself and my friends prefer water-based polyurethane. When used with an alcohol/water wetting agent, you get much deeper penetration than MM or PVA (both items just bond the surface of the ballast). We use the poly (satin finish only) for ballast, ground cover,shrubbery and stone roof tops. Once cured, you can clean your layout with a shop vac and everything stays put. Take care around turouts, I keep the ballast away from the throw rod and the pivot points, then I put a few drops of light oil on the rod and pivot points. This keeps the poly from bleeding under these spots and bonding or insulating them. Any brand will do, just make sure it is WATER-BASED. Get a quart and try it, you probably won,t use anthing else!!
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