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Another deck seam question

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Jim Godlewski
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Location: Saint Clair Shores, Michigan

Another deck seam question

Post by Jim Godlewski » Fri Jun 24, 2022 5:18 am

Our boat was restored using the Danenberg enhanced traditional method per the book. My deck seams between planks are opening up causing cracks in the paint. Sikaflex was used for the seams and a interlux boot stripe paint for the white. When the boat sits in the sun for the day the cracks get worse. I'm surprised these planks move even after being bedded in 5200 but apparently they do. How should I go about to fix this?
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1956 17 Sportsman CC-17-2310
1930 Model 100 7152
https://1956chriscraftsportsman.shutterfly.com/

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Captain Nemo
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Re: Another deck seam question

Post by Captain Nemo » Fri Jun 24, 2022 1:35 pm

Hi Jim,
This usually happens on the live seams, which looks like here. It helps on the deeper seams if you pay in a little cotton before you caulk those.
Boats are to be made of wood, otherwise, God would have grown fiberglass trees.

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Jim Godlewski
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Location: Saint Clair Shores, Michigan

Re: Another deck seam question

Post by Jim Godlewski » Sun Jun 26, 2022 6:12 am

Hello Captain Nemo! Thank you for the tip. Yesterday at the Algonac show I did get the same answer from a local restorer. I now need to consider if it's worth the time and effort.
1956 17 Sportsman CC-17-2310
1930 Model 100 7152
https://1956chriscraftsportsman.shutterfly.com/

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maritimeclassics
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Re: Another deck seam question

Post by maritimeclassics » Mon Jun 27, 2022 7:24 am

It happens all the time. Just tape off the seam and push in some more sikaflex, smooth it out and then paint the seam white. You can't stop it, but you can reduce it by adding a little more caulk. I would not use the cotton method because your planks are not thick enough and they are not beveled to receive the rope. and could really stress or crack the plank when the boat swells.
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Restoration Projects:
1936 25' Gar Wood Custom
1947 Ventnor Hydroplane
1957 17' Deluxe Runabout
1948 25' Chris Craft Sportsman Twin
1959 19' Sliver Arrow Hull #75
1929 26' Chris Craft Custom Runabout
1937 25' Chris Craft Custom Runabout

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Jim Godlewski
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Location: Saint Clair Shores, Michigan

Re: Another deck seam question

Post by Jim Godlewski » Thu Aug 04, 2022 5:19 pm

On my current project, prior to deck planking would skinning with plywood underlayment help this issue?
1956 17 Sportsman CC-17-2310
1930 Model 100 7152
https://1956chriscraftsportsman.shutterfly.com/

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JimF
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Re: Another deck seam question

Post by JimF » Mon Aug 08, 2022 1:51 pm

It absolutely would help if you don't mind getting dinged by a judge at a show. Treat it like a 5200 bottom. Seal 1/8" marine plywood with CPES on both sides and seal the back of your new deck planks. Spread a thin coat of 5200 on the plywood as you install the new thinner deck planks with screws and bungs. Fair the deck and stain and seal. I would seal with CPES and then varnish. The only place the edge of the plywood would be visible is on the ends of the hatches.
This system really helps with a blonde deck boat like a Capri where there are no seams between the blonde planks.That is why you often see these boats with painted seams in the blonde parts. Someone is just trying to hide the cracking and it looks awful.
1930 Chris-Craft Model 100 20' "MOXIE"
1940 Chris-Craft Red and White 25' "Old Paint"
1946 Chris-Craft Sportsman 25' "CinCity"

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