You can use just about anything over EkoFill on an experimental or RC. I would be concerned mostly with flexibility. Especially with urethane enamel. If it's not really flexible it will likely crack in time. Latex would be better, but most latex does not look quite as nice. You can also purchase our EkoPoly down to pint size if you want to go that route.

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You could use it for other things. It works well on composite and fiberglass. It also works well on many other kinds of fabric. We have had people use it for fabric covered canoes for example. The main thing or EkoFill is that it does not have corrosion inhibiting properties, so don't use it on bare metal. EkoPrime and EkoPoxy do and are perfect for metal.

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