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Rebedding/sealing canvas studs and screws?

 
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JMacLeod



Joined: 26 Jun 2018
Posts: 173
City/Region: Stuart
State or Province: FL
C-Dory Year: 2018
C-Dory Model: 255 Tomcat
Vessel Name: C-Shalom
Photos: JMacLeod
PostPosted: Sat Jul 23, 2022 2:30 pm    Post subject: Rebedding/sealing canvas studs and screws? Reply with quote

Hello Brats, long time no-C.
My apologies for not contributing in awhile.
With close family losses both young and old, life for us has been a blurry mess, put on pause since my last post in 2020.
"Man makes plans, God laughs", as grandma would've say.

Anyway, I recently got back in the saddle again and removed all the canvas snaps and frame hardware to have the gelcoat professionally done and ceramic coated.



The Florida sun is brutal on both gelcoat and batteries, so I also removed the benchseat top to replace both start batteries and need to re-bed it.



I bought some new stainless studs and screws to replace the original self-tapping ones.
Hopefully they'll stay easier to snap and unsnap in the long run.



Before installing the new screws and rebedding the seat, what's the advice on sealing them?
I have Sikaflex, 4200, 5200, and butyl sealants at my disposal.

Finally, I'm still playing around with those darn fishboxes.
While trying to figure out gasket ideas, I noticed two missing hinge screws that need to be replaced.



Any advice for those and the rest of the screws before any more decide to work themselves out like the one in the hinge above it?
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JMacLeod



Joined: 26 Jun 2018
Posts: 173
City/Region: Stuart
State or Province: FL
C-Dory Year: 2018
C-Dory Model: 255 Tomcat
Vessel Name: C-Shalom
Photos: JMacLeod
PostPosted: Tue Jul 26, 2022 12:11 pm    Post subject: Reply with quote

Decided on 4200 for the snap studs.





Just enough to fill the threads and squeeze out the rim.
Cleans up nice with a toothpick after it sets for 15-20 minutes.



Still wondering what to bed the bench seat top with, Sikaflex or butyl?
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thataway



Joined: 02 Nov 2003
Posts: 20803
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
PostPosted: Tue Jul 26, 2022 1:36 pm    Post subject: Reply with quote

I like 4000, in that it does not yellow, as 4200 tends to do. But the 4200 works well.

For plastics I like the Boat life, life calk. It is a urethane/silicone combo and best for plastics.

There are multiple Sikaflex compounds. You would have to specify which one you have.

Good on renewing the boat! If. you find a "cure" for the fish leaking gaskets--worth a bunch of $$$$

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Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL
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djstelly



Joined: 18 Jul 2021
Posts: 2
City/Region: Saint Francisville
State or Province: LA
PostPosted: Wed Jul 27, 2022 7:19 am    Post subject: Reply with quote

For the missing screw on fish box lids, look into SST nylon locknut with washer for bevel head bolts 8-24 or 10-32 size versus wood or sheet metal type screw.
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JMacLeod



Joined: 26 Jun 2018
Posts: 173
City/Region: Stuart
State or Province: FL
C-Dory Year: 2018
C-Dory Model: 255 Tomcat
Vessel Name: C-Shalom
Photos: JMacLeod
PostPosted: Thu Aug 11, 2022 4:10 pm    Post subject: Reply with quote

thataway wrote:
For plastics I like the Boat life, life calk. It is a urethane/silicone combo and best for plastics.

There are multiple Sikaflex compounds. You would have to specify which one you have.


I have a cartridge of 291, but I can order some Boat Life if you think that's best.
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thataway



Joined: 02 Nov 2003
Posts: 20803
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
PostPosted: Thu Aug 11, 2022 6:45 pm    Post subject: Reply with quote

JMacLeod wrote:
thataway wrote:
For plastics I like the Boat life, life calk. It is a urethane/silicone combo and best for plastics.

There are multiple Sikaflex compounds. You would have to specify which one you have.


I have a cartridge of 291, but I can order some Boat Life if you think that's best.


Here is directly from the Sika website:

Quote:
Sikaflex®-291 must not be used to seal plastics that are prone to stress cracking (e.g. Plexiglas, Polycarbonate, etc.).


I have not used Sika products--they are less expensive, and for many items that might make a real difference. The 3M products have become outrageously expensive.

The hybrid silicone/ urethane of Boat life, Life Caulk is what is recommended for plastics to fiberglass.
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JMacLeod



Joined: 26 Jun 2018
Posts: 173
City/Region: Stuart
State or Province: FL
C-Dory Year: 2018
C-Dory Model: 255 Tomcat
Vessel Name: C-Shalom
Photos: JMacLeod
PostPosted: Fri Aug 12, 2022 10:48 am    Post subject: Reply with quote

Thanks Bob.
I bought the 291 based off of recommendations when bedding the cleats, but ended up using butyl for them.
I'll use the Life-Calk for this application.
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