Has anyone used areo fix spray adhesive,and is there any problems regarding surface finish,and the release from mould,many thanks.
I use super77, put the fabric in the mold with no gel coat, and then clear coat afterwards to give it a nice surface after trimming. Some will suggest Cammie 373 I think its called. But it takes 3x more cammie than super77. I don’t like it.
77 spray gets my vote. although its illegal in aerospace…
Whys thos then die to reduce in tensile strengh?? Or other reasons
I have tested Aerofix. Seems to work OK. I have seen quite some trouble with 3M 77 spray glue (behind gelcoats) so I feel hesitant to use that.
I also like the Airtech Airtac2 (in UK probably available from Tygavac). Don’t like the Econotack however…
I once had some problems with a steady supply of this material, so I decided to find an alternative, which I had private labelled. Also available in 17 liter cannisters (self propelled). Nice thing about it is that a decent amount of testing (by a university) has been done to see the effects on ILSS. All others I asked did make claims, but could not back them up with tests.
Why is super77 illegal in aerospace technologies? Is it because super77 has a silicone in it and can cause delamination of the layers if too generously used? I use it as sparingly as possible but with some parts its verry difficult to. I have noticed however, that rarely parts will not infuse if you use too much super77. It has happened to me three or so times.
Other things I have noticed… Super77 dissolves quicker with polyester resins than others. I’m assuming becuase of the styrene content in polyester resins. Especially polyester infusion resins. A part I made with a polyester infusion resin infused quicker and showed less glue under the gel coat than the same part with vinyl ester. Specifically hydrex 100.
In general hand laminating or infusion resin has the same styrene content.
Actually to make a hand laminating resin from an infusion resin, I need to add styrene (and other ingredients which influence rheology)
But indeed most vinylesters have a lower styrene content than polyester resins.
anything not described in the process spec is considered illegal… i have never seen a spec list super77 as an appropriate adhesive in an aircraft lay up. thats the only thing i have to say about that.
now days with pre preg you generally dont need a temp adhesive… because you debulk so much and can use heat to slurry the resin a bit.
but for cloth… theres hundred of ways to cheat and even more ways to make a bad part… so. if i was paying for a high quality part and was told it was 100% made right and only had resin a graphite in it… id be made if i payed for a part that was 99.9 resin and graphite and .1 super 77 spray. lol.
thats it really.
Keep in mind that nowadays a lot of aircraft parts are also made using infusion. Also the aircraft industry has to tighten their bellies…