About this deal
No, this Polyfilla is moisture-resistant not waterproof. if used outside it will not last, the constant exposure to heavy rain will damage it. Again like the painting, no it cannot be sanded. As I mentioned before it is a flexible filler. That means it is a bit rubbery, which then means it is not suitable to be sanded like normal Polyfilla. More On Polyfilla
This filler needs a minimum of 6 hours before it can be exposed to water, so make sure it is fully dry or it may just wash out! Can It Be Used Outside? No this is more like a silicone filler than a regular Polyfilla. That is what gives it its flexibility but it also means it is not suitable for being painted over. Can It Be Sanded?
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