1978 Skipjack 20

rowdyrosco

sancho
Apr 9, 2009
513
184
43
PSL
Name
ross
Boat
Skipjack 20
These things are cool for fillets
https://www.westsystem.com/application-tools/reusable-mixing-sticks/

I like q-cell 400 with just a little cabosil for filler/fillets, cabosil doesn't add much volume and is very brittle, you get lots more bang with q-cell. If you have a bunch to do you can mix a whole bucket with just the q-cell, catalyze what you can burn in 10 min, and then thicken with cabosil. You'll figure out the catalyst, get the squeeze bottle with the shot glass on top. If its cold .5/oz, if its hot .33/oz, if it's too hot to glass .25/oz.
 

stank

Well-Known "Member"
May 16, 2005
660
468
63
62
Norwalk, CA
Name
Dave
Boat
None
We used to use a dark olive colored adhesive (I don't remember what it was called) that had the consistency heavy wheel-bearing grease.

We used it primarily for bonding steel, fiberglass or other parts to fiberglass components. Stuck better than cabosil and was much more flexible when hard. Someone else may know what it is called and or if it is still used.

We used cabosil more for filling holes and cracks, not for sticking parts together.

We didn't build boats, we built fiberglass tanks, transitions, duct-work & dampers.
 

brokeass boater

Well-Known "Member"
Feb 23, 2010
1,058
446
83
Norcal's Brentwood
Name
Gregg
Boat
24' Skipjack w/Pilothouse, 21' Marada, 15' Boston Whaler
Don't worry you'll get the amounts figured out and you be pretty good at glassing as you get into the project. There are free mixing charts online that give you wt. of fabric to how much resin. They are based on optimum ratios, so use as guides to start to keep from mixing too much and wasting resin. Another tip to reduce extra sanding keep the area around your joints nice and smooth as you work, free from excess peanut butter lumped up. Its much easier and faster to blend instead of grind that stuff down, especially in a compound corner where the sander cant get into. Two things I wish I did on mine, make the fish box deeper, there was room under it, but would need a macerator to clean out. Also the dash on these boats are friggin small. Wish I wouid of cut the factory out and fab'd/glassed one in with a better lay out. Stay at it my friend, there will be times when this work gets old, but you'll forget about those days the first time you sea trail it after its done,,,gregg
 

tuna taxi

Well-Known "Member"
Jun 11, 2004
1,741
92
48
48
92335
Name
Jorge
Boat
20' Skipjack
Since the sun decided to show its face today and because I was out of work before noon I decided to get the new angle grinder out, slapped an 80grit flap disc in it and went to town!!

Well, first I worked on getting some of the leftover glass pulled off the deck, it only makes sense to rip out as much of the out fiber by hand rather than sanding it out.

I took the disc and started grinding down the lip of resin that was left where the original stringers met the hull. I took it slow at first because I wasn’t to sure how much resin the 80grit disc would remove but once I got the hang of it I knew how much pressure I could put on it. I didn’t get the hull to the point where it’s ready to glass but I did manage to work out all of the ruff edges and high spots.

Heres a few pics:

P.S.

As far as the last two pic go, I don’t who, why or when it happened but it looks like two of the water pickup tubes got placed to close together so someone put on their thinking caps and...........

10A49CA9-0A39-40FA-A1AB-DA510CE53620.jpeg 3934292B-41E6-4551-BB0D-174B238FB91B.jpeg D40CFF3C-0BA3-4C05-84E2-DED7C5A2A96C.jpeg 1EE184FD-2D2B-432A-9E48-EFC5BEA10443.jpeg EAE0A5A6-3C10-4C3E-B779-81A9EC68FABC.jpeg 81562A30-7FC3-4BAB-A169-A284C5A88D29.jpeg EA901636-6611-45C4-944C-263478BB0099.jpeg 1A0F1F21-C382-4262-910B-CFCE4558C062.jpeg
 
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tuna taxi

Well-Known "Member"
Jun 11, 2004
1,741
92
48
48
92335
Name
Jorge
Boat
20' Skipjack
how much of the hull resin do I need to grind off in order to get good adhesion on the glass that I'll be laying down when I add the new stringers?
 

stank

Well-Known "Member"
May 16, 2005
660
468
63
62
Norwalk, CA
Name
Dave
Boat
None
how much of the hull resin do I need to grind off in order to get good adhesion on the glass that I'll be laying down when I add the new stringers?
We just ground until it was flat and smooth, no shiny spots. Make sure you hold the grinder as flat as you can, particularly as you’re using a 4”. I like a 7” much better.

The flatter and smoother you get the work, the better your bonds will lay down.

Do you have a decent shop-vac? Makes a nice dust collector while grinding, particularly if you have a kid to hold it...
 

mokahehteh

Waterman
Sep 29, 2004
878
436
63
50
Orange County
Name
Randy
Boat
21' Custom Half Cab
Radon boats.com has the boat at $70,000 with a 150hp on bracket and a standard cabin. 4,000 lbs.... solid (big) little boat.
Would that be Pliogrip? If so, it's an amazing two-part adhesive for sure. I've done some static & dynamic tensile testing with Pliogrip... it's tougher than a cheap steak!
 

tuna taxi

Well-Known "Member"
Jun 11, 2004
1,741
92
48
48
92335
Name
Jorge
Boat
20' Skipjack
So, when is enough not considered enough?

The pics show some of the grinding that I’ve completed on the center stringer as well as the starboard and port side stringers that were removed due to rot. I’ve noticed that in order to remove any trace of the old fiberglass and resin I need to grind out anywhere from about 1/16” - 1/8” of resin. Is it really necessary to grind out all of that resin or will just making it smooth give me the same results when the new glass is set?

0A6E7F61-DC4C-4134-AAFB-E519D600D580.jpeg 8A005550-8F0B-461D-A321-D54AD1F54911.jpeg 1C854146-1026-4CF8-ADF5-2575C9271FD4.jpeg
 

fishgrappler

Member
Jul 4, 2015
210
88
28
45
Name
Bru
Boat
Skipjack 24 Open
Great question. I'd say it depends on who you ask. I'm at about the same point as you on my project. I started out trying to grind ALL the old tabbing out, but reality set in and it's just not gonna happen. Now I'm content with just feathering it out. Is it gonna be perfect? No, but it's still gonna be better than before I started.
 

karlow

Twins 2017
Apr 29, 2004
1,625
610
113
62
Duarte/Covina
Name
karl
Boat
20' skippy Topless /17' whaler Wet Ride (sold) /18' Outrage
I don't know but if you are going to rebuild using epoxy you can stop grinding. Epoxy will stick almost anything.
 

jigstrike

SCUBA Spearing Daddy
Feb 28, 2004
1,189
451
83
50
Sabre Springs
Name
Tom McKinney
Boat
Pacific Option, a 2006 Tiara 3000 Open
Did you de wax before you did the grinding? Even very old hulls can have wax leftover from curing and grinding without cleaning can drive it down into then hull.