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One thing to keep in mind with 3m and bondo brand resin is that it has surfacing wax in it. If you need to add more layers after the first layers cure, you'll have to sand the entire top layer in order to get a good bond with the first layer. If you know ahead of time that you'll be doing multiple coats, get a good layup resin. Also, bondo resin is not very consistent, it can be thick in some batches and thin in others. After using resin from US Composites, I'll never touch bondo brand resin again. It so much easier to use good layup resin.
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