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  1. #76
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    Vacuum test of the vacuum chamber is complete

    with the hoses disconnected from the vacuum pump, and vacuum leaks plugged, a vacuum of -27.5 inches Hg has been maintained for over eight hours


    next test: resin infuse laminates with cores

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    Last edited by noli; 07-27-2020 at 06:14 AM.

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  3. #77
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    Dual Resin Infusion

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    two parts for resin infusion


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  5. #78
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    has anyone tried pre-wetted fiberglass cloth then vacuum bagging (not infusion) the transom core (ex. coosa) with the vacuum bag folded over the outside of the transom ?







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    Last edited by noli; 08-18-2020 at 08:52 AM.

  6. #79
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    I put supports to lift cap and hull side to square-up the hull


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  8. #80
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    for testing purposes, took 2 small areas for the removal of delaminated fiberglass.


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    Last edited by noli; 10-11-2020 at 01:47 PM.

  9. #81
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    after removing the loose delaminated glass, then sanding back to solid adhesion

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  10. #82
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    I hate glassing over roving. I don't trust it's adhesion to the laminate after it has been flexed. Same thing with uni directional. Once you cut the strands grinding, it weakens the whole thing. But you can see what I can't.

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  11. #83
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    What if I use epoxy?

    Would the mechanical bond to roving be stronger?

    I also plan to vacuum bag the new laminates.


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  12. #84
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    Epoxy best, but vinyl is good too. Working time is real difference. Either with vac bag is good. Gets resin all thru old glass. Just investigate real good all the areas to be glassed over. Not saying it won't stick. Just that heavy fibers tend to be the ones that seperate. Less able to flex. That looks like 24 oz roving. Has mat under and between?

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  13. #85
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    someone put a second laminate covering over the original roving (blue color). That second laminate is what is delaminating at certain areas.

    This second laminate has mat under it.


    I will investigate by doing test areas with vacuum bagging to see how well it adheres or will my test not prove anything (and over time it will delaminate)?




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  14. #86
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    I hate to say it but you may find that the overlayment may have to be removed. I dunno. A test area is not a bad idea. Pick an area you think is good, and try it. I see a good bit of iffy glass. The original laminate should be good quality?

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
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  15. #87
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    the overlayment is strong for most of the hull. I tried to rip off pieces at certain areas and I swear I'd probably rip a hole in the hull.

    There are multiple weak areas though where the overlayment is delaminating or will delaminate with little pulling force. These are the areas I wish to concentrate on to remove the weak "bond" of the overlayment. And leave the areas alone where the bond to the overlayment is strong.


    After I remove the weak-bond areas of the overlayment, what do you recommend I do before applying the foam core?






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    Last edited by noli; 10-11-2020 at 07:49 PM.

  16. #88
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    found a nice article on secondary bonding to woven roving

    https://www.boatdesign.net/threads/s...-woving.55294/








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  17. #89
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    here's a nice paper on sandwich composite panel joints...the butt joint is plenty strong!


    https://journals.sagepub.com/doi/pdf...99636218792676







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  18. #90
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    here's a nice paper on secondary bonding procedures (adding new laminates on top of say, woven roving)

    Note: this link is a PDF download link

    guide to composites - Guritwww.gurit.com › media › Gurit › Datasheets › guide-to-c...






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    Last edited by noli; 10-12-2020 at 07:58 AM.

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