Hi Geoffrey,

Thanks for the questions, I'll anwer them one at a time;

Where can I find the release tape you use to recap the holes, the gel coat sprayer and the adhesive spray (if you please have links)?

All of these items are due into stock very soon and will be available from our website over the coming few days, I will post the links as they are put up.

Why did you use gel coat in the bonnet infusion and not in the other infusion video?

Gel Coat is completely optional, on a component that is likely to be outside fro much of its life (like a bonnet) the added protection is an advantage, this can also be achieved with a clear coat of 2k paint, however full gloss components can be produced without any surface coating and obviously they will prove to be lighter. Most of the parts we manufacture do not have any coating.

Why do you use peel ply in the full part (the sonic core instructions said the vaccum bag won't stick except with elastifilm so peel ply won't be usefull)

Although you can do the infusion without peel-ply we have used it over the entire part as we will be bonding the parts together and the peel-ply offers an ideal surface for the adhesive to bond to. If you are not bonding to the reverse of the part it is fine to leave the peel-ply out.

In the first infusion you use sonic core material and in the second one, the carbon 660g, what is the difference between the both and does it have a equivalence

We used the Soric for the upper skin of the part because this has large flat areas which benefits in stiffness greatly from the 'core' material, the inner skin of the part has lots of intricate shapes and can afford to be a thinner laminate due to the inherant strength in the shape. There is no real equivalence between the 2 layups, the bottom skin is only 0.9mm in thickness whereas the top skin with the soric is 2.4mm. it is also worth pointing out that although perfectly possible laying soric around the intriacte shapes of the inner-skin mould would be challenging.

Is it possible to use an other tool than a brush to laminate? I thank especially to the gel coat sprayer loaded with resin or plastic spatula

Firstly I would advise against spraying the epoxy for 2 reasons; firstly epoxy resins are pretty harmful as an atomised 'mist' you would want to avoid breathing that in, so spraying is really a non-starter, secondly I know from spraying polyester resin systems that it doesn't really have any advantages during lamination. A plastic spatula can prove to be a very useful tool especially on flatter areas, you might also want to try a sponge brush, I've never got on that well with them but others have.

I have to make a 75mm diameter tube, so I think to buy this https://www.easycomposites.co.uk/80mm-carbon-fibre-braided-sleeve but I don't find how to do. I have a personnal idea but I would like to be sure

The Braided sleeve is essentially like a big sock! the normal method to produce a tube would be as follows;

Select a suitable mandrel (PVC tube is great) stretch over the number of layers that you require weting them out with resin as you go, after this you would want to wrap the sleeve tightly with the high shrink tape, quickly heat it up with a heat gun to contract the tape and then leave it to cure.

I hope that covers it, if you want me to elaborate anywhere then let me know.

Paul Statham
Easy Composites / Carbon Mods - Technical

thank you very much Paul for your helpful answers.