Carbon fiber roof - making the mold


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Warren (Staff)
Warren (Staff)
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That will repair no problem. Once the repair is filled, its just a case of flatting back then polishing to a gloss to match the rest.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
VVS
VVS
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Repair it mate, like Warren says its cut out, fill,sand then polish.

You will regret it as the marks will be in the part and its a real ball to work after.

I went to my local paint supplies and got a Velcro foam polishing kit that fits a rechargeable hand drill, they are cheap and very easy to use, add to that a medium compound polish and you will be amazed how good you can get the mould to look.
BlackNDecker
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Thanks gents...looks like I will be spending some time on minor repairs.

I will use the chisel, gel coat, and tape method illustrated in the "How to carbon bonnet" easycomposites video.
VVS
VVS
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If you take a look at the last picture I posted on my bike build you will see a mould done using the uni mould system, ive polished the in part piece and left the outside as was, you can see the difference between the two parts is quite pronounced and was done in half an hour with the drill and foam mop, very easy to do and well worth it.
Hanaldo
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Definitely worth repairing, especially given it is a large flat surface. Will only take 20 minutes of sanding to get it perfect. 

I suggest doing the repairs sanding it flat and through to 1200, then give the whole mould a flat down with 1200 before compounding. You'll be amazed how much better the surface can be. 
BlackNDecker
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These are very small, shallow surface imperfections in confined areas...

Should I:
a) sand and scuff with 80 grit then spread a thin layer of gel coat over the surface imperfections?
b) chisel the small areas down to the fiberglass underneath and fill with a thin layer of gel coat?
BlackNDecker
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VVS (13/06/2015)
If you take a look at the last picture I posted on my bike build you will see a mould done using the uni mould system, ive polished the in part piece and left the outside as was, you can see the difference between the two parts is quite pronounced and was done in half an hour with the drill and foam mop, very easy to do and well worth it.


Thank you...I will try to have a look. I'm having a bit of trouble navigating the forum with my iPhone 6+ presently. When I click on an individual thread it loops me back to the main forum page.
Hanaldo
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Nah use a scalpel to pick away any loose bits and just scratch up the imperfections. Then use a pop stick to dab the gelcoat into the low areas. Remember to fill them proud of the surface so you can sand it down level. 
BlackNDecker
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Hanaldo (13/06/2015)
Nah use a scalpel to pick away any loose bits and just scratch up the imperfections. Then use a pop stick to dab the gelcoat into the low areas. Remember to fill them proud of the surface so you can sand it down level. 


So just to be clear, scratching/roughing up the area with a scalpel will be sufficient to create a strong bond between the mold surface and the "repair" gel coat?
Hanaldo
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Yeh it'll be fine. Scratch it up well, it's just easier than trying to sand inside the alligatoring. Make sure it's clean. 

This is the method I always use to repair any alligatoring, all my repairs are still perfect. 
GO

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