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advice on extending fibreglass panel

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  • hmmm
    replied
    Re: advice on extending fibreglass panel

    Hi Nick,

    no you wouldn't use gelcoat as a filler cos the bonding wouldn't be good enough to cured matting but a 50/50 will work like I said previously.
    In the UK there is also a fibreglass paste that contains carbon which seems to be an excellent filler for blow holes or building up edges like door gaps.
    Conventional filler is obviously very easy to use and sand down etc but ultimately I would say in your case as it may be advisable to aim to keep the use of convential filler to the minimum and try and do your modifications with more compatable materials and finally finish off with the bare minimum of convential filler.
    I'm not an expert on kit cars but I am very experienced in plastics technology but equally i'm not a smart arse, just trying to contribute.

    Leave a comment:


  • nick200
    replied
    Re: advice on extending fibreglass panel

    hmm, you've raised an interesting point ( 1st - i totally agree with chamfer the egde's , more surface area and also not a defined line for the dreaded sinkage ! at a later date. )
    The point i'm referring to is for the top of the repair - using a gelcoat mix, sort of makes sense since its then the same material as the rest of the panel . I would actually have used a filler since i dont have any gelcoat yet. But what about all the rest of the filling on a fibreglass car - should we be using gelcoat as a filler ? I suppose they are actually similiar materials being resin based ? I dont know the answer - its a good point for discussion !

    PS - i've made the cuts ! no photo's yet, but taping them in postion looks ALOT better. ( and yes there was lots of staring at the arch and photo's before getting the power tools on it also!

    Leave a comment:


  • hmmm
    replied
    Re: advice on extending fibreglass panel

    Originally posted by Ferrari-spyder
    I wouldn't fiberfill that amount, it will crack at some point. The best way would be to cut the panel and move it into position and then fill the gap with a fresh piece of fiberglass. For the filler fiberglass, layup some mat on a flat panel (glass perfered as it wont stick to that) and then cut it to fit the gap. You may want to check to see if the 355 is suppose to have this offset in it. I cant remember right now if it is like that or not on the real one.
    Yes I would agree with that but it may be worth considering setting the filler or joining matting below the surface of the existing gelcoat either side and then use a 50/50 mix of resin & gelcoat to make up a surface finish to blend in with the original gelcoat either side of where you have cut. Also it is probably beneficial to chamfer the cut edges to increase the surface area of bonding on the edges. I.E. if you chamfered a 3mm thickness to 45degrees the bonding area would increase to just over 4mm and you create more of a feather edge join as opposed to a direct butt join hence long term less likely hood of hair line cracks.
    I said a 50/50 mix cos it'd a happy medium as gelcoat won't bond properly to existing matting but resin will and the mix will allow you to apply a slightly thicker coating.
    Not everyone may agree with me but I am just trying to be helpful.

    Leave a comment:


  • FerrariFan
    replied
    Re: advice on extending fibreglass panel

    Nick,
    I must have sat and stared at that wheel arch for several hours and then measured and marked and took pictures and studied them some more on my computer. In the end it all boiled down to taking the sawzall and going for it!

    Leave a comment:


  • Don
    replied
    Re: advice on extending fibreglass panel

    Being one of the unfortunate fellows on here that has taken crap copied panels and cut and pasted every panel on my car to get close to the right shape and fit, I recommend you do the cutting and pasting effort as FerrariFan has described. It really is pretty easy to do and much more worth the effort with the end result.

    I think you will be happier with the results than filling in with wood and glassing over.

    My 2 cents.

    Chees adn good luck.
    Don

    Leave a comment:


  • nick200
    replied
    Re: advice on extending fibreglass panel

    Ferarri fan, your finished car looks stunning ! what a good job. Its interesting the wheel arch defect is almost the same for both our cars. That must have taken a bit of bravery to start the cutting, really is a case of going past a point of no return !

    Your right about always fitting the body with the wheels on, an essential reference point i think. Are those BBS LM's ? v.nice.


    A concepts - thanks for an alternative and the diagram ! , i see what your saying - and also no cutting.

    I will mull it over and post progess,

    many thanks again for your help.

    Leave a comment:


  • ca360c
    replied
    Re: advice on extending fibreglass panel

    here is what you need to do no cutting just make a buck after you take the tire off
    then make a temp of area you want to fill in
    after then use mdf 1//8" to wrap the wheel well
    then fill in the red area with mdf and then glass
    but first you will have to grind down or sand to raw fiberglass so it will bond togeather
    hope this helps good luck

    Leave a comment:


  • FerrariFan
    replied
    Re: advice on extending fibreglass panel

    Here's after paint. Opposite side but same process.
    Attached Files

    Leave a comment:


  • FerrariFan
    replied
    Re: advice on extending fibreglass panel

    Imagine my horror when I put my wheels on and saw that! The lesson here is to keep your wheels and tires mounted when installing the body. Even so there wasn't anyway to move the body back that far. Here's a pic right after I took the sawzall to it and one of the finished wheel arch before paint.
    Attached Files

    Leave a comment:


  • lowboost
    replied
    Re: advice on extending fibreglass panel

    holy cow, that looks like dentistry! I wasnt aware that the AD kits had that flaw.

    Leave a comment:


  • FerrariFan
    replied
    Re: advice on extending fibreglass panel

    I had the same problem. I cut up the fender and bumper and then screwed the pieces back together where they needed to be. I roughed up the inside and cleaned the surfaced with solvent, then applied several layers of fiberglass cloth and resin to the inside. I filled the gaps with kitty hair and smoothed everything with a layer of filler. If you look close you can see the picture of the real 355 that I taped to my fender to use as a guide.
    Attached Files

    Leave a comment:


  • nick200
    replied
    Re: advice on extending fibreglass panel

    ferrari-spyder thanks for reply, and yes i agree - the idea of too much fibrefill is not ideal !

    A layup on glass it is.

    I have checked with OEM 355's, the gap is equall all around the wheel - to wheel arch.

    Leave a comment:


  • Ferrari Berlinetta
    replied
    Re: advice on extending fibreglass panel

    I wouldn't fiberfill that amount, it will crack at some point. The best way would be to cut the panel and move it into position and then fill the gap with a fresh piece of fiberglass. For the filler fiberglass, layup some mat on a flat panel (glass perfered as it wont stick to that) and then cut it to fit the gap. You may want to check to see if the 355 is suppose to have this offset in it. I cant remember right now if it is like that or not on the real one.

    Leave a comment:


  • nick200
    started a topic advice on extending fibreglass panel

    advice on extending fibreglass panel

    i need to extend the rear wing on my rep, to make an equal spacing around the rear wheel.



    Just wondering if anyone has any tips on doing this ?

    I'm thinking at the moment there are 2 options:

    1 - Fibrefill the gap & filler to finish.

    2. Cut the return edge off (and reuse ), space this to the correct distance then make good the gap. However i am worried that by doing this, the panel may change shape once the return is removed.

    By the way the correction required is about 20mm.


    My main concern is making a lasting job, so i'm not going to see any cracks or sinking in 12 months !

    Any thoughts most welcome !

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