no Ive actually tested it out…If I got a glob of glue on the gel coat I could literally take my finger and lightly dab it and make the stuff let the air loose.
I tried about 10 times and could even get a finger print if I wanted to.
As soon as I spray I know if I need to fix it or something…Id prefer to not use glue but tex sucks balls for working with out it.
I have tested with the same mold two times:
What can I say:( 
are you letting the airtech cure when spraying? when i spray super 77, i make sure to spray it with air to have it dry out and bubbles out.
Sorry, what do you mean you spray it with air?
i use a compressor to spray it dry …
Ok, so you spray with 77 and you live it to cure, as I understand. That’s it?
yes b/c i noticed when i sprayed it, little bubbles would form. also, make sure u shack the can REALLY well.
Ok Luisn I will try, thx anyway.
interesting…Im going to try the infuzene and see if its any better than the 3m with regards to trapt bubbles.
George…I figured you knew what I was talking about…Ive run across most problems already. I hope you figure it out and make better parts.
Ohh yes hybridracers,
and really guys you help very much, Werksberg I love your site.
Thank you!
…but with my teaching pay gone, I may be asking for some donations to help off set costs on here…
I just read on racingcomposites.com that Super 77 is not compatible with Ester-based resins. Can anybody confirm/debunk this? I’m wondering if that is why George is getting bubbles. I’ve personally used Super 77 when infusing a part with PER (I use the Orthothalic Infusion Resin from FiberglassSupply).
Cheers,
Jeremy
I heard another user say they use 3M 75 spray adhesive…works better because its less permanent… you can work with the fabric still.
I’d be using epoxy with 3M adhesive, but that’s me. Is Orthalic better than iso PER?
I’m not sure exactly what the differences are between Iso- and Ortho-thalic polyester resin. The ortho that I got from fiberglasssupply is definitely lower viscosity than the Iso I got from fiberglast… I tried infusing with the molding iso resing I got from fiberglast and it was like watching molasses flow on a cold winter morning - even when I cut it with 10% solvent to help thin it out.
I’ll have to check out that 3M 75. Thanks for the tip!
Why not ask your supplier for resin suitable for RTM process, rather than trying to use something designed for a quite different process?
There are a lot of resin systems manufactured, and getting the right one, and asking for a tech data sheet to be supplied with it, is going to save money, and make things a lot easier.
people must be different in the UK. I have the HARDEST time getting ANY technical support from US manufatures and suppliers
this is correct. This is even what the tech guy from airtech told me. no ester resin desolves the spray.
So it is safe to say that epoxy resin will disolve the spray adhesive?
Anyone know where to buy 3M #75 spray adhesive? I went to home depot and it seems they sell all of them except for the 75.
Where online do you buy the Airtech spray adhesive?
you ask a lot of questions, but do you ever use google.com or the search feature?? there are millions of posts on here about all the questions your asking. im not trying to sound like a dick, but most ppl here will get tired of posting the same answer over and over.
asking something like, infusion epoxy… thats generic.
asking something like, at 25" of hg resin is not traveling fast enough… what can i do… someone will answer with many reasons why, flow media, resin is catalyzed to much, heat? etc.
you have to ask questions that has never been answererd or you cant find the answer via search…
example #2… airtac2 from airtech… hmmmm… google airtech the company, then find the product, then find the distributor…
I haven’t seen the airtac 2 spray for sale online anywhere. You can go here: https://www.airtechonline.com/htm/defaultIE.htm and request a catalog. I’ve worked with Craig Hill. Real nice guy.
Cheers,
Jer