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Darkening Exterior Shutters Finished With Spar Varnish2/7
I need to darken some faux exterior shutters that were stained with an oil wiping stain and finished with a couple coats of McCloskey's Man o War Marine Spar Varnish.
The shutters have already been installed, and I was thinking of giving them a light sanding with 220, applying the same stain or a similar colored oil glaze to get in the sanding scratches to shade the shutters down, then I could brush on one more coat of the spar varnish.
I'm not too familiar with exterior spar varnishes, but shouldn't this work? Would there be any adhesion issues with the final coat of spar varnish? Would it be better, adhesion wise, to use a glaze or okay to use the same stain they were initially stained with?
Not a good idea. Stains are meant to be applied to bare wood. Short of stripping down to bare wood, your best bet may be to mix an appropriate colorant into the spar varnish and apply a few coats to darken the color. "Appropriate" colorant would be determined by the type of spar varnish. The term "spar" is applied to vastly different products, including the original oil-based stuff, as well as polyurethanes and even water-based. Best to check with the manufacturer to see what they recommend.
You can use artist oil colors mixed with some japan drier, paint thinner and some of the top coat. Wipe it on and use a dry brush to even it out, then top coat it. I've done on entry doors many times. Just make sure the oil color is good and dry before top coating.
Thanks for the suggestions. I think if I can find a stock color that works I'm going to use Old Masters Gel Stain(instructions specifically address using it for this application) and then another top coat of the Spar Varnish. Either that or see if my supplier can add color directly to the varnish.
Look at Sikkens Cetol product line. Though Sikkens will state that their products should be used only on 'new' wood, and no implied warranty, it could work. Only time will tell.
And, for what its worth, I don't like Sikkens products today!