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Compatible caulk with Outlast q8 Log Oil?

We just bought a 10-year old log home that has been vacant for the last two years and is in need of some care. We have the Outlast q8 log oil to apply, but want to prep properly and make sure we have a good lasting caulk to go with it. Of course we are looking for something as strong as possible, long lasting, flexible, waterproof, you get the idea. Does not need to be paintable.

I am having trouble finding consistent recommendations on the type of caulk to use. I've read that polyurethane caulk is best, but is most difficult to apply and takes a long time to dry.

Anyone have experience (good or bad!) with a compatible caulk with the Outlast q8 Log oil?

Tags: caulk, log, oil, outlast, polyurethane, q8

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Permalink Reply by CharisB on May 23, 2012 at 12:57pm

I can tell you this: please don't use Sashco's caulks with Q8. We've done both tests in our lab and had people use it in the field. When applied BEFORE Q8 is applied, it will work OK but there are still risks. The oils in the Q8 can leech out of the wood over time and cause the caulk to lose adhesion. When used AFTER Q8, it won't ever get a good bond in the first place. This is going to be the case with most any water-based acrylic latex caulk. In our experience (and not just because we make them...) acrlyic latexes are best for log homes. They are every bit as hardy as polys for the application, have good memory and are the most elastic. Polys are great for hardiness, but aren't very elastic and, indeed, are difficult to apply (not to mention that they cost more than acrylic latexes).

For the most part, the only caulks that will work with heavily oil-based stains like Q8 are oil-based polys. I don't have a specific brand in mind. While they won't perform as well with elasticity, they are about the only thing that will stick.

Your other option is to switch stains, if you haven't already applied the Q8. Go with something that you'll know to be compatible with acrylic latex caulks made specifically for log homes.

Hope that helps some.

-- Charis w/ Sashco - www.sashco.com - cbabcock@sashco.com

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Permalink Reply by Scott Castle on May 23, 2012 at 1:43pm

I would recommend that you call the manufacturer. 1 877-536-1446. I also agree with Charis. If I remember correctly they prefer you use a latex acrylic but a silicone base can be used but the time frame between caulking and staining must be longer than 30 days to allow drying. I can tell you from personal experience that I loved using Q8. Looks great, applies well and love that clean up. They also advised that I can use it for topical application on the deck. The drying time is 7-14 days. I not quite sure how I like that. On flat surfaces I'm concerned about dust, pollen accumulation while drying. I happened to caulk my home prior to this winter and just completed the staining. Looks awesome. scott