cost of extending the life of a mid 70s fiberglass hull

Discussion in 'Fiberglass and Composite Boat Building' started by Wellington, Jun 30, 2018.

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  1. ondarvr
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    ondarvr Senior Member

    We have regions in my territory where the average summer temperature is in the 40+C range, they don't add styrene. They understand why adding more is not desirable.

    Never mind, this conversation will go nowhere, its one of those where someone insists on making three left turns to go right.
     
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  2. gonzo
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    gonzo Senior Member

    You advocate not to listen to boat experts but to engineers and chemists instead. Since you are none of the three mentioned, your advice should be completely ignored. There is no penetration of gelcoat into the laminate. The bond is generated primarily chemically (atomic bonding) and secondarily mechanically. The first is the one that matters. Spraying wood and fiberglass is not a valid comparison. As for contact cement, your claims are unfounded. Actually, all your claims are since there is no experimental data to back them up. If you rattle the chain of engineers, be prepared to have your claims torn apart for having no foundation or basis on fact.
     
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  3. MurphyLaw
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    MurphyLaw Senior Member

    You seem to know a lot about my method, yet you have never asked any questions?

    You wont get gelcoat to spray from a 2mm nozzle without adding styrene, I think your method will involve purchasing $5000 worth of hardware before you even start and even then you are talking a mold finish and not a hull finish. You are aware that spraying gelcoat into a mold and spraying onto a hull require totally different strategies? My method requires a $20 auto spray gun, gelcoat, styrene, wax. Nobody is going to extend the life of a mid70s fiberglass hull for more than the cost of a new hull.

    Spraying at temps above 30degC wont give a good finish, 40degC and you are 20 above manufacturers specs they styrene will be gone before the gelcoat can even flow on the surface let alone react. You must be a wizard to spray at 40+. I would just do the job just after sunrise so I can keep within 5degC of manufacturers spec. We are talking about spraying a showroom finish here and not into a mold right?

    Yes never mind this seems to be more about you asserting intellectually supremacy rather than assistance.
     
  4. MurphyLaw
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    MurphyLaw Senior Member

    Qualified engineer in 1992 with distinction , get a new crystal ball.

    The spraying onto wood gives you a worse case indication of the mechanical bond you will get if the surface absorbs the styrene it also shows you what effect it will have on the gelcoat on the surface if styrene is lost to the wood before it has finished reacting.

    A hull with the gelcoat sanded off has;

    1. scratches from sanding
    2. exposed glass fibers
    3. air pockets

    all of which absorb the styrene.

    Contact cement application requires allowance to be made when sticking absorbent surfaces together, read the instructions.

    You mean if I rattle the chains of rude trolls like yourself, If you haven't got anything to post that contributes positively to the conversation then best troll elsewhere.

    I do believe that I have discussed RE: cost of extending the life of mid 70s fiberglass hull

    1. equipment used
    2. method employed
    3. results
    4. analysis of those results

    Neither of you have have contributed positively ie:

    Hey I disagree, I use a 3mm nozzle gravity fed gun without any styrene then spend the rest of the day sanding the gelcoat smooth.etc etc.

    You just sought to belittle me with zero factual content or experimental content. Facts are supported with references from scientific or manufacturers papers, experimental see points 1 to 4 above.
     
  5. gonzo
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    gonzo Senior Member

    Scratches or "air pockets" can't absorb styrene or any other solvent
     
  6. MurphyLaw
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    MurphyLaw Senior Member

    Wrong, get a dictionary

    they will take in the styrene or any other liquid.

    absorb
    əbˈzɔːb,əbˈsɔːb/
    verb
    verb: absorb; 3rd person present: absorbs; past tense: absorbed; past participle: absorbed; gerund or present participle: absorbing
    1.
    take in or soak up
     

  7. Boat Design Net Moderator
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    Boat Design Net Moderator Moderator

    Probably a good point to close this particular thread.
     
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