boat stuck in mould

Discussion in 'Fiberglass and Composite Boat Building' started by whacker82, May 25, 2012.

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  1. whacker82
    Joined: Sep 2011
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    Location: ireland

    whacker82 Senior Member

    you're right, this is the first time ive done someting like this but ive ye guys to help me along the way and show me what to do next plenty of pictures will follow as i go, and will be open to any suggestions even if it means going back over what i did. the reason i said i cant see it taken too long is this, its in only two places that the most damage has been done in one of the stringers and the where the keel meets the stem. now ive made wooden keys to fit perfectly into the stringer and keel/stem, leaving a space for the sand paper. so this is will sand down the gel coat to the exact shape of each the stringer and keel/stem. as for the chips in the clinker part of the mold its open to me i have plenty of room for elbow movement on all 5 spots so im not too worried about this.
     
  2. tunnels

    tunnels Previous Member

    The thing is when you fill is to fill just over what is needed and make a nice job . Dobs ,globs lumps and bumps and rough work means lots of un nessesary sanding . Never thin gel coat at all with anything !!!!specially if you are filling and dont over load the gel with catalyst !! its easy to do with small quantities of material .small plastic containers are best to use and when finished can check the gel time and the gel coat hardness in the container without touching the repair .If the gel inn the container comes out 100% clean from the container then its mixed properly if it doesent means its not mixed properly and you could have dead spots or soft patchs.
    Old story do the job properly dont have problems !!
     
  3. tunnels

    tunnels Previous Member

  4. rawleyjerel@yah
    Joined: Apr 2012
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    rawleyjerel@yah Junior Member

    sounds like negative draft !! if it is your doomed, but heres an idea try to grab the mold on either side where its hung up and pull them outwrds, this may give enough room for the part to slide by the hang up either way youll mangle the part some. try using chainfalls to pull with this may work good luck
     
  5. whacker82
    Joined: Sep 2011
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    whacker82 Senior Member

    ok this is the spray gun what will this be good for???

    [​IMG]

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    [​IMG]
     
  6. wet feet
    Joined: Nov 2004
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    wet feet Senior Member

    If you read the entire thread,you will see that an earlier hull was released and completed.After some repair another hull or hulls are entirely possible.The builder might even get around to reading the Recreational Craft Directive when he has a few minutes free from repairing moulds too.
     
  7. rawleyjerel@yah
    Joined: Apr 2012
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    rawleyjerel@yah Junior Member

    midnitmike is right try some cabosil in your gel coat to make a thin putty that will make it stay in place
     
  8. tunnels

    tunnels Previous Member

    The gun !!

    :pDo you know what you have got ? first of all you need to completely and totally strip everything off it and soak it in acetone for 24 hours !!A sealled plastic container witha lid . the paint should literally fall off . even the threads need to be cleaned and spot less. when its clean lay everything out and use a light smear of vasaline on the threads when you start to reassemble . at any time dufing its use the gun may need to come apart quickly to clear some dirt or what ever to get it to work again . you need to be able to dtake it apart and clean and reassemble almost with you eyes shut
    Gravity feed guns are ok and have there uses they will spray a ggod range of paints etc but doubtful if you will be able to spray gelcoat . quite well and you need to get and be familiar with all the controls what each one does and why !!. :D when its all back togeher and no bits left over time to go spray a few gallons of water on anything where you can see what pattern you have . ;)

    If you search the net theres likely the same gun and a parts list and how to make it work !!
     
  9. whacker82
    Joined: Sep 2011
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    Location: ireland

    whacker82 Senior Member

    YOu don't think I'll be able to spray gel coat wit this? WOuld it spray the pva for me? If it won't spray gel I'll leave off getting a gel coat gun till I sell one or two boats. I'm nervous about putting money into it all. JUst in case the repairs don't work out for me. Material should be here tomorrow so I'll post up pictures of what I got and what I've done at the evening.
     
  10. tunnels

    tunnels Previous Member

    pva not a problem , any paints not a problem , doing gelcoat repairs not a problem but spraying gel coat very doubtful . dont think about thinning you gel coat with any thing because if you do it will be the end of all our discussions !!
    point taken ??:(
     
  11. whacker82
    Joined: Sep 2011
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    whacker82 Senior Member

    That's grand the pva is the more important one for me here. I can't afford any more mishaps or its the end of my business. If I can spray the pva I'm happy. I'll brush the gel coat and resin. I inspected the boat that had to be cut out of the mould and the gel coat was 100 per cent so applying it wit a brush is no problem. Getting it stuck again is my worst fear at the moment. I'll plan on getting a proper gel coat gun if I pull a couple of boats from the mould
     
  12. tunnels

    tunnels Previous Member

    Hand brushed gell will and does give a better shine and lasts longer !! any idea why ??
    the best shineyest mould i ever seen were all hand brushed tooling gel theres a perfectly good reason why !!:rolleyes:
     
  13. whacker82
    Joined: Sep 2011
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    whacker82 Senior Member

    Dunno why?
     
  14. tunnels

    tunnels Previous Member

    Back to basics !!when catalyst is added and mixed into the gelcoat the chemical reaction produces gas bubbles to form !!,when you spray a thick coat of gell the bubbles are working in the gell on the mould during the time the gelcoat is in a semi liquified state the bubbles gradually find there way to the surface and burst untill the gelcoat starts to thicken and eventually gel so the bubbles produced are unable to escape . when you brush your gell by hand you are making the bubbles burst quicker and the more you brush the more gas is disapated and squashed out of the gel coat . During the early days we only hand brushed all and everything !!porosity was almost totally unheard of . our moulds we always brilliantly shiney and places where its common to get heavy build ups of gel these days we never saw porosity .We always had to brush the gell coat 4 times ,back and forth then dip the brush and apply another brush load and so on and so on it was askill i learned and have never forgotten and it just became second nature .we also second coated always and used a wide paint roller and coated quickly becasue second caot was 2% plus catalyst !!
    It wasnt untill we started to use gel coat spray equipment that strange things began to appear that we had never seen before .pigment separation and veiling we pretty common place to begin with but once the guys got used to spray and the gel coats improved those problems eventually vanished . these day the guys dont know when the see a problem they have no ideas what caused it so has been a time of schools in and showing and making sure they know the causes !!.
    Gel coating with any spray gun it is better to do multipal fine spray coats over the surface than to simply apply one thick coat !Gel coat has a thixotrophic added to make it hold onto a vertical surface so you can get the required thickness and not simply run off like paint will do !!painting and gel coating are diffeant and just because some one can spray paint dosent make them a gelcoater !! . Its the thixo thats the reason the gravity feed gun or the standard spray gun is not suitable to spray gel coat !! unless you have a really big nozzels to allow the gel to be drawn through . With Pressure pot presurising the gel and forces it into the gun and the air semi atomises the gel into a spray . Spraying gel coat is a art and takes leaning how to do it . some people never learn and even after years are still struggling with the whole concept .
    Thinning gel coats is a no no it changes the gelcoats make up and if you have any problems you have no back up from the manufacture . DONT DO IT !! :(
     

  15. tunnels

    tunnels Previous Member

    Jesus i cant believe this site has drawn so much attention and had so many hit !!!:confused:
     
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