We don't have any other videos showing the cup gun in use and to be honest, I'm not sure what benefit you would be able to get from a further video.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

do you have any other video were it is beeing used and sprayed other than the bonnet series?

The "flow control" knob literally controls the flow by adjusting the pressure so there is unfortunately no "rule of thumb" we can advise as it depends on input pressure, viscosity of material being sprayed etc to find the ideal pressure.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

so quantity is not the problem as i´m mixing 150gr for a 1/2 square meter mould...

It depends on your compressor but you are wanting to be between 60-100PSI using the standard nozzle as supplied.

Hold the gun approximately 50cm from the surface and use a gentle sweeping action across the mould.

You will probably need to adjust the pressure to suit your compressor as they are all slightly different.  We would recommend a practice on a scrap panel of some kind to help you get the "feel" of the gun and get an even coverage.

In terms of usage you will use 3-400g per square meter for a typical coverage of 0.3-0.4mm, however you will need to mix approximately 500g for each square meter to cover wastage.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Thanks Warren.

It does sound like you are applying it too thick or there is something else going on you haven't discovered yet. 

We don't recommend brush application of GC50 for infusion as the force presses the carbon into the brush marks making a slight distortion on the weave. It's fine for wetlay as the fabric will float on top of the resin and remain undistorted.

A tip that works for some people to help fisheyeing is to apply a layer or two of Mould Release Wax on top of your chemical release agent. It helps reduce the slippyness of the surface slightly and often that is enough to get a nice application down.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

I appreciatte your help with the infusion but the point here is to try to understand what is wrong (or what i´m doing wrong) with the GC50 Gelcoat.

To be perfectly honest, I think you have an issue with either your resin (too high viscosity) or starving your part of resin .. I've just infused a tank cover (around 0,7 sq mtr, since the mould used up a complete standard Unimould kit .. ) It does not have a single visible pinhole in the whole of the "usable" area... This was with a microscopic leak that I just could not find, dropped vacuum completely in 5 hours --- but I just kept the pump running  .. Yeah ... I know ... should have spent some more hours finding the leak ... or rebagged, but it was a first test of the mould and some new lay-up ideas (for me at least ) The part came out near perfect, apart from the pattern of the carbon having shifted slightly making my intended stripe of spread tow off center .. I need a better way of making it stay in place when fumbling around with the backing layers and bagging ...

"Sapere Aude"... Dare to KNOW!

The written word is the only truly efficient vehicle for transmitting a complex concept from mind to mind...

103% of all people do not understand statistics...

Do not adjust our mind, theres a fault in reality :-)

Could this be gas in the GC50?  Superfine bubbles might not be visible as bubbles but would make a coating cloudy.  Spraying doesn't aerate a coating sufficiently to cause this as it picks up large(ish) droplets.  You could try degassing the GC50.  (just an idea).