Unless they have changed the formulation recently or offer a different version in the UK, we found in testing with infusion, Aerofix 3 had a negative effect on surface finish.

We have yet to find a spraytack that is perfect. If we could find one, we would almost certainly stock it as finding a perfect epoxy spray tack is one of our customers most common questions.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Hi Hanaldo

Thanks for taking the time to take a picture. The spray I was looking at was marked as Cytec rather then Umeco. Strange. I think there was a merger in 2012. The current data sheet doesn't state comparability with epoxy. On the can you have there is a small star next to 'epoxy resin', is there another star with further information on your can? Maybe on the rear of the can?

Data sheet I found here

http://www.metyx.com/Uploads/GenelDosya/12201311171114.pdf 



ThanksCraig

This is the stuff I use:

It definitely is. I'll take some pictures today. 100% compatible with epoxy, and 100% invisible whether you use an in mould coating or not. 

Thanks Warren. Yes, the aim is to do the complete bodywork with a V join down the middle of the car. Front half of the car this winter (hopefully!). How is the Kitten coming on on? I'm looking for some inspirational pictures!  

Aerofix 3 isn't epoxy compatable so I would suspect it wouldn't be so invisible without a gelcoat/clearcoat in the mould.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Aerofix 3 crosslinks with the resin and becomes totally invisible. I did a test the other day, behind Duratec Sunshield top coat in mould. Sprayed a really heavy amount, would never come close to spraying that amount normally, then layed up and infused the part. Had absolutely no sign of the spray adhesive, and being behind the top coat I wouldn't have been able to clean it up. 

The best spray tack to use is one made from infusion resin.

Mix up a small batch of resin with hardener, then put it in a small 1-200ml hand spray bottle. Something like this:


Dilute with purple methylated spirits around 10% or so (by eye) and keep adding meths until its dilute enough to spray through the bottle.

Then spray lightly over the mould surface and leave to cure for a couple hours until tacky. et viola, DIY spray tack that fully crosslinks with the resin during infusion and leaves no visible marks.

3M 99 is ok if you plan on flatting and then lacquering the part.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Very nice work, going to be one trick looking Westy

Warren

Carbon Copies Ltd