Mako 254 rebuild

Seabird254

Newbie
Jul 13, 2020
50
50
36
Charleston, sc
Name
Jeff
Boat
Mako 254
Was able to get some more work done. Got rest of stringers in and first bulkhead bedded. Gotta get a move on I wanna fish next summer.
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Seabird254

Newbie
Jul 13, 2020
50
50
36
Charleston, sc
Name
Jeff
Boat
Mako 254
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Got the step down completed with two more bulkheads in.
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Rigging tubes in. They double as fuel tank supports.
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More molds for the side hatches. Went the simple route this time and it worked surprisingly well. Wood wax clay and melamine.
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Flow coated with epoxywhich was unnecessary. It just made the finish more gloss on the hatches, but I waxed the wood as well as double protection. Both came off easily. Two coats wax.
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Need some more clean up but you get the point. 4 more of these, a bilge hatch and eventually an ancor hatch to go.
 
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SD2600

Opinions aren’t constitutional- they are earned
Apr 13, 2017
666
542
40
San diego
Name
Dustin
Boat
26' sea swirl
Looking good. How big are those tanks? Do u have a guess on what your range will be?
 
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Dream to fish

Deck Swaby
Jul 25, 2009
380
139
Hell, CA
Name
Phil
Boat
20' Beachcraft Cuddy
How is the transom attached to the hull? It looks like it's just epoxied to the sides and bottom of the hull? The stringers seem OK, but there should be glass spanning the joints between the sides/transom as well as the bottom/transom.
 
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Seabird254

Newbie
Jul 13, 2020
50
50
36
Charleston, sc
Name
Jeff
Boat
Mako 254
about 5 layers of 1708 and 1808 tab in the transom. The upper sides of the transom will get tabbing after floor and cap go in. Stringers run through the transom and butt up to the bracket transom. In reality the actual boat transom is acting as a large bulkhead, the bracket is built like a hull extension. In the pics the tabbing in the bracket hasn’t been done yet either. It will be around 1/4 glass tabbing in the bracket. Bracket sides are between a 1/4” and 1” thick depending on if they are in corners or joints.
 
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Seabird254

Newbie
Jul 13, 2020
50
50
36
Charleston, sc
Name
Jeff
Boat
Mako 254
Did some more prep on the bracket. Had to shave the stringers in the back a bit to clear the mounting bolt holes. Mounting holes over drilled to be back filled with epoxy. Next up is fillets and glass.
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Dream to fish

Deck Swaby
Jul 25, 2009
380
139
Hell, CA
Name
Phil
Boat
20' Beachcraft Cuddy
Interested to see how you fill the holes with epoxy and what type. I've done some similar stuff lately....
 
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Seabird254

Newbie
Jul 13, 2020
50
50
36
Charleston, sc
Name
Jeff
Boat
Mako 254
Well this will be the second time around as the first attempt smoked off on me. It’s been in the 90s here and that size hole is too much epoxy in one place for it not to overheat. I re drilled them and this time around I will have to fill them a little bit at a time. It’s 3:1 laminating epoxy from US composites thickened with cabosil and has chopped glass added for strength.

even had the epoxy on ice before mixing and it still smoked off
 
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Dream to fish

Deck Swaby
Jul 25, 2009
380
139
Hell, CA
Name
Phil
Boat
20' Beachcraft Cuddy
I've been using the 2 to 1 635 epoxy from US composites. I've noticed the same thing as you. Laminating epoxy gets too hot in that volume. I just recently filled my transom with casting epoxy/cabosil. I used "Magic Resin". It's designed for that type of stuff and doesn't overheat and smoke. I went with the magic resin as that's the only one I found that had advertised strength properties.
 

Seabird254

Newbie
Jul 13, 2020
50
50
36
Charleston, sc
Name
Jeff
Boat
Mako 254
Yea it’s really just a matter of timing for something this small. A huge area you would be better off with something like a poly based reinforced pour transom material.

if you do it in stages and let it kick off then add the next layer, these I’ll probably do in 3-4 stages over a few hours or a day. While it’s kicked but still green you avoid having to prep the surface but I’m a little neurotic and probably still will lol. Also helps have a lot of filler in the mix like glass fibers as it displaces the epoxy a bit.
 

Seabird254

Newbie
Jul 13, 2020
50
50
36
Charleston, sc
Name
Jeff
Boat
Mako 254
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got the last of the stringer glass on, 3 layers 1808 and 3 layers of 1708. Also cored the mounting holes. I smoked off the first attempt at filling them with thick mix to the point that the epoxy cracked and I had to drill them back out. So I decided to core the holes with 1" pvc. Thick mix and a layer of 1708(on rear 1/4" glass), 1" pvc, 1/4 glass puck from the original drill out, then thick mix to fill the gaps. Glassed over the top with 4 layers of 1708 as a backer plate for the mounting bolts. Bolts will also get a large washer. Over complicated something simple, but the heat is real and epoxy cooks quick even when chilled.

I filled the transitions at the ends of the stringers with thick mix, and do a wipe of thick mix with a straight edge to fill any gaps before I lay glass. The white spots you see is resin not air bubbles. Makes it a bit easier to avoid air bubbles if you do it right.
 
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Dream to fish

Deck Swaby
Jul 25, 2009
380
139
Hell, CA
Name
Phil
Boat
20' Beachcraft Cuddy
Looks good. I would consider sealing the inside of the smaller holes through the PVC foam/epoxy/glass plugs with epoxy after you get them drilled?
 
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