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Scarfing plywood
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Scarfing plywood
Hi, This is my first post as I am new to the fourm. I have a 1960 23' Sea Skiff and am re-bottoming.I am getting ready to start scarfing boards together and was wondering what type of adhesive is best. Is epoxy ok ? High desity filler or low?
Thanks,
Dave
Thanks,
Dave
Adhesive
The adhesive used on sea skiff bottoms was thiocol. Thiocol is similar to 3M 5200. Its tougher than BoatLife. Either is flexible and not hard like West system. I wouldn;t use epoxy.
Jim Evans
Evansjw44 is right. The scarf should replicate the flexibility of the plank itself as much as possible. If you use epoxy you would have a stiff section in the middle of a flexible plank, not good. 2500 will create a strong, yet somewhat flexible joint which will bend in a very fair curve.
http://www.boatartgallery.com
1956 CC Connie 47'
1959 Caulkins bartender
1965 Cheoy Lee Frisco Flyer
1953 Chris Craft Holiday
1941 Chris Craft Deluxe
Plus 8-12 customer boats at any time
God don't count the days spent messing around in wood boats.
1956 CC Connie 47'
1959 Caulkins bartender
1965 Cheoy Lee Frisco Flyer
1953 Chris Craft Holiday
1941 Chris Craft Deluxe
Plus 8-12 customer boats at any time
God don't count the days spent messing around in wood boats.
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you are talking about a butt to butt joint not a scarf ?? Jim Evans and other are right on...5200 has some give for the scarf....if that is what in fact you are doing. End to end (butt to butt) you need a butt block behind the joint anyway.
Nice project, good luck.
John in Va.
Nice project, good luck.
John in Va.
1980 Fairchild Scout 30
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)
I disagree strongly. You don't want any "give" in a scarf joint. Epoxy is the only way to go for a scarf joint in plywood. Use 5200 in the lap between adjoining planks. Use a minimum 8:1 slope in the scarf joint, pre-wet both ends with unthickened epoxy, then batter on epoxy thickened with wood flour or plastic mini-fibers. The scarf joint will be as strong and as flexible as the rest of the plywood plank without any hard spots.
- Kevin
- Kevin
I guess I'm "other" haha...anyway I dont have a problem with either method, although if the plank is to have a serious bend then I use 5200. In either case the wood will fail long before properly cured epoxy or 5200.
http://www.boatartgallery.com
1956 CC Connie 47'
1959 Caulkins bartender
1965 Cheoy Lee Frisco Flyer
1953 Chris Craft Holiday
1941 Chris Craft Deluxe
Plus 8-12 customer boats at any time
God don't count the days spent messing around in wood boats.
1956 CC Connie 47'
1959 Caulkins bartender
1965 Cheoy Lee Frisco Flyer
1953 Chris Craft Holiday
1941 Chris Craft Deluxe
Plus 8-12 customer boats at any time
God don't count the days spent messing around in wood boats.
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- Posts: 2092
- Joined: Thu Dec 29, 2005 10:41 pm
- Location: Powhatan Courthouse Virginia
- Contact:
I respectfully disagree with Kevin. Though clearly the Gougeon goop is better in a scarf than other applications where some "give" might be more welcome.
Sorry I called art the "other" but I can't seem to scroll back to see who said what tonight??
"Go West young man" has never appealed to me.
John in Va.
Sorry I called art the "other" but I can't seem to scroll back to see who said what tonight??
"Go West young man" has never appealed to me.
John in Va.
1980 Fairchild Scout 30
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)
No problem John.
http://www.boatartgallery.com
1956 CC Connie 47'
1959 Caulkins bartender
1965 Cheoy Lee Frisco Flyer
1953 Chris Craft Holiday
1941 Chris Craft Deluxe
Plus 8-12 customer boats at any time
God don't count the days spent messing around in wood boats.
1956 CC Connie 47'
1959 Caulkins bartender
1965 Cheoy Lee Frisco Flyer
1953 Chris Craft Holiday
1941 Chris Craft Deluxe
Plus 8-12 customer boats at any time
God don't count the days spent messing around in wood boats.
I recently reframed my Sea Skiff and replaced a number of bottom planks. You may find this discussion thread on the Danenberg Boatworks Forum useful. I scarfed full-length replacement planks with epoxy, and repaired several plank sections with butt blocks and 5200. 5200 was used in all plank laps.
http://eveforum.danenbergboatworks.com/ ... m/63410169
- Kevin
http://eveforum.danenbergboatworks.com/ ... m/63410169
- Kevin
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