DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Roofing and Siding > What is the best caulk to use for exterior wood or Hardie Board?

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Old 12-26-2011, 07:24 PM  
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Default What is the best caulk to use for exterior wood or Hardie Board?

Anybody got an opinion on the best caulk to use for exterior wood or Hardie Board? Iíve tried using both latex caulk and polyurethane. The polyurethane lasted longer but seems to attract all sorts of dirt, even when it is top coated, and sometimes shows through the top coat when the topcoat starts to wear. Most of the joints are pretty narrow, but sometimes Iím caulking gaps up to 3/8Ē wide. What tools well and also holds up well? Thanks.

Rick Merlander
Molokai Hawaii
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Old 12-29-2011, 09:52 AM  
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I use Alex 230 on Hardee plank and never had a problum with it.
Apply it, wipe with a finger then wipe it down with a damp sponge.
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Old 01-03-2012, 03:38 PM  
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Now that OSI Quad can be used with mineral spirits, it's my favorite. Not easy to work with, though...takes some practice and a paint thinner soaked rag.
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