Reefie's LB26

[Fuzz]

I have read secondary bond strength is 10% if chem bond.

There are probably some studies done.

I'll see what I can find, however, JM would probably recommend wet on green; especially under climate controls or low humidity.

Dang 10% I would have guessed closer to 90%
It would be nice to see some studies, it might change the way I do things.......big time.

[fallguy1000]

Don't do it without testing Reefie.

The test is simple.

Just cut four pieces of scrap glass the same size like 4" wide by a foot long.

Then work two of those scraps into your next effort and wet them out onto plastic.

About 9 hours later epoxy another layer halfway onto one of the other pieces.

After you sand your boat, sand the other sample.

Then wetout another piece of glass onto it.

Allow both samples 48 hours to cure.

Try to pull them apart and compare the effort.

I will run the test here as well and report back.

Best of luck. I have trusted wet on green same day; never overnited.

[Grit19]

I cannot offer any insight as to the difference between the two glassing techniques, but I will say, as a future bateau builder, reading these discussions sure is enlightening and hopefully by following these discussions I will be better off when building my own boat. I sure hope you all will chime in with any comments / advice for things I might be doing incorrectly or inefficiently because I will be needing and appreciative of all the help I can get!

Other than that, I do want to tell Reefie it is good to see you back on the build! This is a cool looking boat and your posts are always fun to see. Your work looks great to me.

I continue to watch and read with great interest.

Best,
Gib

[reefie]

Great discussion... and great suggestion to do a test.
Next glassing run I will also do a 4 way test and report back;
1. wet on wet (as a control)
2. wet on overnight green no washing to remove potential amine(about 18 hour interval to simulate realistic re-coat time)
3. wet on overnight green and wash to remove potential amine(also about 18 hour interval to simulate realistic re-coat time)
4. wet on cured sanded/washed

We are in the final days of winter, with relatively high humidity, and average night temps about 9 deg C (48 F) and average day day temps about 16 deg C (61 F). I should also note that it is the conditions at this time of the year when amine blush production is at its maximum.

Happy building
Reefie

[BarraMan]

I have read secondary bond strength is 10% if chem bond.

I'm not buying that and personally I wouldn't waste my time on testing!

You simply can't glass a big boat wet-on-wet, so the only way to effectively manage it is to sand between glass layers.

For my boat, I did each layer of glass cloth over the whole boat as wet-on-wet, then gave it a good week to set, sanded with 80 grit paper on a random orbital sander, washed with clean fresh water, let that dry then wiped over with acetone.

I only used peel-ply on the last layer of glass.

I don’t believe that my boat has 10% the bonding strength of a boat that has multiple layers of glass wet-on-wet!

How can you glass a boat this size wet-on-wet?


PS: Reefie, love your boat - it looks fantastic!

[reefie]

You simply can't glass a big boat wet-on-wet, so the only way to effectively manage it is to sand between glass layers.

EXACTLY... and I guess this is what I was alluding to in my opening post on this topic. However, I will still do the tests as a matter of interest because I'm keen to know.

Anyway, I have sanded and prepped the bottom plates for the next glass layer. Probably wont happen until next weekend unless I get a chance around my work commitments during in the week.















Happy building everyone!

Cheers Reefie

[OrangeQuest]

Looking very good!

[Jeff]

Beautiful boat Reefie, really well done!! Jeff

[Grit19]

I like the plank walkway you’ve made around the boat. I bet that makes it a lot less difficult to work on the bottom of your boat.

What are the black things you have holding down the fiberglass, and what is their purpose?

Thanks,
Gib

[fallguy1000]

The picture of the bow is remarkable.

I can't wait to see more.