Okay, now I have an issue with shrunk planking, well, the fellow who bought my sharpie, Atavistic, does.
I built the boat from cypress, planked athwartship. I applied 3m 6501 to the seams to accomodate a certain amount of shrinkage as the boat lives on a trailer. Never did a seam open up on me--ever. I kept the boat outside under a mesh cover so it wouldn't dry out. It got wet, etc. and the wood stayed in place. Just as planned for.
Now--the new owner, in an attempt to take even better care, kept it in a storage unit. It seemed to me that would be okay. He wrote me today with this:
I am beginning to undertake my first major project on Atavistic. After sailing her several times this past late summer, I’ve been very busy with work over the last couple of months and she’s been garage-kept while I’ve tinkered with this & that and had a nice cover/bag made for the spars & sails. Now it’s time to pay the price for deciding to keep her dry & stored out of the weather – I’ve discovered that the reason sailors say “Aaarrrrggghhh!!!!” is likely related to winter-time hull caulking projects…….
Unfortunately, keeping her dry has resulted in some wood shrinkage – I’m looking at 5 – 6 seams in the hull planking that have separated. I started noticing some gaps in the painted glue joints at the deck surface and was prepping to sand/fill/repaint when I spotted daylight coming through a couple of the joints where the glue joints had completely separated. I’ve started cleaning out the joints with a thin putty knife but now need to find a better tool to clean the glue from the edges of the planks.
Any suggestions that you have for a better tool to clean the joints would be greatly appreciated – obviously I just want to remove glue but not wood.
The other thing I’m hoping you can help me with is the best caulk/glue to use once I clean the joints & tape them from one side. I’m going to flip the hull over to clean the joints from the bottom and sand/paint the bottom while I’m at it.
My main concern is whether the glue that you used originally requires clamping pressure or not – obviously I cannot clamp the joints. However, I am fully aware that I need a caulk/glue that will “squeeze” or compress when the wood swells again in the future to prevent stress (compression) cracks forming elsewhere in the hull.
So--he's well aware of what could happen. I'm inclined to suggest he clean his seams, put the boat back outside to take up a bit, then work more 6501 into the seams.
--He cannot remove and replank, nor do I believe he has to.