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I have contracted to replace an exterior balustrade for a local church. It is to made constructed entirely of redwood which has to be glued up and milled. This balustrade will be directly exposed to the weather all the time, and East Tennessee weather runs from very hot to very cold, and from very dry to very wet. What glue should be used? One step further……. what type primer and finish paint should be used?
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Resorcinol, epoxy, or polyurethane - preference in that order. Somebody at Sherwin Williams or DuLux will steer you in the right direction regarding prepping the surfaces and painting. FWIW, my choice would be an exterior latex in semi-gloss, but you need to match the gloss with the rest of the woodwork.
*gorilla glue......... I do alot of finish work outside with cedar/redwood, had good luck with it.
*I have built a lot of projects in redwood that have been outside in the hot sun and rain. I have also laminated redwood to form curves. I have used both Gorilla glue and Tightbond II. Initially I tested both on different types of glue joints and immersed the joint in water for three days (obviously not intended or recommended by the manufacturer) and found the differences between the two to be minimal. I am now testing the HiPurformer hot glue. The only advantage of Tightbond II is that it is easier to clean up as it doesn't foam like the Gorilla glue. I do not use any nails or screws in my projects but depend entirely on the glue joint and dowels.
*For finishing the new exterior (redwood and Doug Fir) trim on my wood windows, I used Zinser primer over the raw wood, followed by Hascolac primer and Hascolac high gloss, oil-based enamel.This stuff is extraordinary, and goes on beautifully. It has lasted in the California sun without any degradation for about three years so far. It's expensive, but for a limited project that must hold up, the cost delta is not much.JA Mike
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