At :45 in the video they are doing something called “fiber glass coating”. What are the pros and cons of doing this?
Thank you
[ame=“http://www.youtube.com/watch?v=NBvUgNRiJdY&list=PLCBB3639A4CF00C54&index=6”]CARBON FIBER BY: ROBSON DESIGN QUALITY MANUFACTURER - YouTube[/ame]
Any one? Somebody has done this before im sure.
I think they are making a mold of something.
They may be using silmar 249 resin with that fiberglass. It’s for surf boards, crystal clear, excellent UV resistance, and that layer of glass is easy to repair so it protects the carbon beneath… Maybe.
In fact, they dry sand just before applying the glass. Must be to help the 249 grab the epoxy. Those parts are cosmetic. Will probably last long enough.
They are using the the carbon to give strength and still keep light weight?
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Not likely. They are simply overlaying parts for cosmetic benefit.
I could not link to the video so I kind of jumped at that blind
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I make cosmetic car parts and use the same process, but I never do fiberglass coating. I dont know what is the purpose of this, the only thing that I think is to cover any gap or get volume before covering with carbon.
Can it be for building up layers so that you dont burn through ?
I think it’s adding glass to wet out, no pin holes, and then being able to sand smooth without eating into the CF weave. I was expecting to see a scrim, but that was random mat…thick, and NOT transparent I thought. Depends on the resin too. Odd.
Danny had it right most carbon car parts are made that way tho keep cost of the part down. I have seen allot of car parts priced out for different layout usually carbon over fiber, carbon layer wet, and dry carbon I am assuming pre - preg.
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A little misinformation in that vidio goes a long way, maybe? not quite how they do it? hmmmmm…merry christmas everybody:)
I think the only way to avoid pinholes and sand without eating CF is adding a lot of layer of resin to get enough thickness. If you add fiberglass over de CF you don’t get transparent.
Are you sure ? have you ever tried to polish fiberglass ? It is glass after all .I will be experimenting with this soon .
You can usually see most glass layers, even the lightest ‘veil’ layers, in good light. 0.3 and 0.6 oz/yd^2 are commonly used for surfacing applications and even after good flow coats the fg is visible if you know what you’re looking for. That being said, these veils are usually e-glass instead of chopped strand which is what is used in this video. On top of that, in this video it appears as if the CS mat is layed down below the carbon weave layer. I really have no idea why they would do that, and as mentioned above, maybe it’s not their real process for cosmetic parts or is part of another production process that doesn’t deal with CF wrapped parts. It becomes even more noticeable when you burn through the glass veil layer in some areas and leave it intact in others, so they’re not using it for burn through protection.
Later in the video the definitively show that they are adding many, MANY layers (more than I’ve ever seen! Based on the run off and drips shown) of flow coat to get rid of any pinholes associated with the wrapping method.
How many layers are average ? I run 5-6 .
Of flow coat? I don’t think it matters, usually flow coats are applied for cosmetic reasons so the goal is to just apply enough to get an even, high gloss, and pin-hole and air bubble free surface finish.
I only commented on the huge amount of flow coat they’re using because it probably means their build method is a very labor-intensive process. But then again, this is composites so what isn’t 
is it better to apply more clear coat or more resin?
If you’re trying to cover up pin holes from a wrap or wet lay process, then resin flow coats are necessary.
It’s almost impossible to fill pin holes with clear coat. You’d have to shoot it multiple times, and you can’t put very thick layers on because of paint runs and solvent pop.