RE: 3M super 77!
The formulation for the 3M Super 77 changed last year due to EPA regulations in California. I stopped using it because it's much different from what it used to be, besides the fact that it sticks. Supposedly Airtech has a tack spray that doesn't do this but I haven't tried it yet. So for now I'm just using up the old stocks of the Super 77 wherever I can find them.
Posted on: 1/18/2005 6:47 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2556057

RE: Vacuum system on how long?
With no leaks, I just leave the pump off. It's good for the pump. You should get a vacuum switch, that way the pump will only run if the vacuum falls below your preset level.
Posted on: 1/12/2005 12:48 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2531523

RE: 2-Part Foam
Aircraftspruce has a location in georgia
Posted on: 12/20/2004 11:01 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2453156

RE: Sand / epoxy molds
Going from epoxy to polyester is a big step the wrong direction.
Posted on: 12/17/2004 1:40 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2442650

RE: Sand / epoxy molds
Haha you guys are going to be responsible for revolutionizing the mold building process. Using sand sounds tempting, but I will stick to my 'dough'. I build a lot of large molds since my background isn't RC so I need them to stay light.
Posted on: 12/15/2004 3:28 AM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2435231

RE: Sand / epoxy molds
The dough is made by PTM&W for room temp as well as for hi-temp application. Here's how I do my molds 99% of the time. Tooling surface coat 4oz cloth 10oz cloth 1/4" - 1/2" thick of the tooling dough 10oz cloth It's polyurethane foam so it's light. I like it because I can build up the mold's thickness without wasting a lot of resin/fiberglass/time. It's extremely strong as well and it's a soft dough that can be worked into hard to reach areas. I also like it because I do build a mold in one sitting and be done with it. Overall I save a lot of time and money so I can't complain.
Posted on: 12/11/2004 4:05 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2423755

RE: Sand / epoxy molds
I use a tooling dough, but never tried the sand trick. Tooling dough is a mixture of polyurethane foam, chopped fiberglass and epoxy resin.
Posted on: 12/11/2004 2:22 AM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2422482

RE: New alternative to vacuum bags
I had to open my refference book for this one since they don't have a website. Arctek Inc. 905-727-0968 11 Candac Valley Dr. Aurora ON, Canada L4G 6W7 They license the whole technology including the material, but you can just get the material to do your own thing. I like their materials, but not their 'patented' process. [quote]ORIGINAL: ptxman [quote]ORIGINAL: buttuh There's
Posted on: 12/7/2004 4:27 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2410683

RE: New alternative to vacuum bags
Resuable vacuum bagging has been around for a while. Airtech, Bondline, Torrtech are probably 3 of the biggest companies specializing in the silicon bag. There's a new company out in canada that sells a clear silicon material so you can actually see through to the layup. Especially helpful in vacuum infusion. These silicon bags normally have a life cycle of about 200-300 parts. It's not popular because it's very expensive. You break even in term of material cost after about 50 parts. But the time you save and the mess that you don't have to deal with is another story.
Posted on: 12/2/2004 11:41 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2397138

RE: CHEAP FIBERGLASS CHOPPER?
fiberglass mat is just a bunch of chopped strands glued together. Roving is a continuous tow that needs to get chopped up if you want chopped fibers. I can see how a blender would work for the mat, but I don't think it'll work in this situation. [quote]ORIGINAL: impactiq We tried it with regular fiberglass mat with success. Beats pulling it apart by hand. [/quote]
Posted on: 11/29/2004 12:37 AM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2384772

RE: CHEAP FIBERGLASS CHOPPER?
Yeah I'm not sure if the blender is a good idea. The blades are probably not sharp enough to cut through the tow and it'll probably gets tangled and clog up the moment you turn it on.
Posted on: 11/28/2004 10:45 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2384495

RE: 1lb density foam for core material.
The lighter density foam could potentially soak up more resin than you would want. I would probably collapse under vacuum also. I guess it doesn't hurt to do a test trial and find out for sure.
Posted on: 11/28/2004 10:43 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2384486

RE: Fiber-Lite Composite Products?????????????
Tom, I have 2 9lb rolls of the 12k roving if you want it. Evan
Posted on: 11/28/2004 11:13 AM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2382458

RE: help composite oven
Nice Ryan, imagine how hot it'd get with a 500W halogen bulb
Posted on: 11/24/2004 11:18 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2373740

RE: High Temp Epoxy
It's not any different from any other epoxy resin. You just have to post cure it afterward.
Posted on: 11/24/2004 12:58 AM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2371194

RE: Pic of Laser level for plug making.
What, where and how much?
Posted on: 11/23/2004 11:16 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2370966

RE: Vacuum Bagging Techniques
Peel ply is NOT perforated release film. They are BOTH release films but not the same material and characteristic. Peel ply is a soft cloth (nylon or polyester based) that allows 100% bleed through of the resin to the breather cloth. Perforated release film is a plastic film that has holes evenly spaced approx. 1/4" - 1/2" a part to allow for some resin bleed through but not all.
Posted on: 11/23/2004 12:05 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2369234

RE: High Temp Epoxy
CJ, Why are you losing strength? Is the hi-temp epoxy you're using weaker than the room temp epoxy that you've used? I've not used Aerospace Composites' hi-temp epoxy but I use a lot the PTM&W stuff which also manufacture the Aeropoxy line. You use it as you would normally and post cure the part at elevated heat. Each resin has a different post cure cycle so you'll need to contact Aerospace Comp. for that info.
Posted on: 11/23/2004 12:01 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2369229

RE: Vacuum Bagging Techniques
I'm guessing that it was the white primer that he used. [quote]ORIGINAL: Blow n Go Looks good. Did you use the West pigment to get the white? [/quote]
Posted on: 11/19/2004 11:16 AM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2358148

RE: help composite oven
How hot do you want it?
Posted on: 11/19/2004 11:14 AM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2358144

RE: A MOLD QUESTION
CJ, what type of damages are you referring to? I for one would rather fix minor damages then pull the mold off to soon. Nicks and scratches I can fix, warp and shrinkage I cannot. I have not used polyester based resin for a while and I'd rather go broke buying epoxy before I go back. Polyester just shrinks way too much, even the ISO tooling grade polyester. And the smell... ugh.
Posted on: 11/19/2004 11:13 AM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2358138

RE: Vacuum Bagging Techniques
You can, but you don't have to wait for the first coat of resin to tack up.
Posted on: 11/16/2004 11:25 AM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2349304

RE: Styrene Gas Hazards
Are you sure it was polystyrene foam? If you were cutting polyurethane foam then that fume will kill you.
Posted on: 11/16/2004 11:24 AM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2349298

RE: Where to get Cabosil?
Aircraft Spruce is cheaper I think. CST is generally overpriced.
Posted on: 11/13/2004 1:59 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2341377

RE: Epoxy vs Polyester - Compatibility Issues
is the graphite/carbon in the form of powder/chopped or are you referring to the actual cloth? If you want the surface to be extra hard, why don't you just try epoxy instead of polyester?
Posted on: 11/8/2004 1:03 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2327098

RE: A MOLD QUESTION
The longer the better. I normally wait a couple of days depending on the weather. You should refer to your resin spec sheet and see what the full cure time is. Generally you don't want to pop the mold out before it's fully cured.
Posted on: 11/8/2004 1:00 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2327091

RE: Is there a shelf life for epoxy?
You're right david. My mistake. I was thinking about outdated casting silicon as I was typing for some reason.
Posted on: 11/6/2004 1:55 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2322356

RE: divinycell sandwich core
Contact Diab Group at www.diabgroup.com and ask if they have a distributor in Asia. I'm sure they do.
Posted on: 11/5/2004 11:11 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2321300

RE: What type of foam for mold?
Try polyurethane foam. It comes in various density and thickness. I wouldn't use polystyrene foam.
Posted on: 11/5/2004 11:09 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2321297

RE: Is there a shelf life for epoxy?
If it's 8 years old chances are it'll start kicking in the moment you start mixing in the hardener. I wouldn't recommend it but it never hurts to try.
Posted on: 11/5/2004 11:08 PM by Author "buttuh" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=2321291