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1/2 oz or 3/4 oz glass

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Old 01-08-2007, 09:30 PM
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jimfc3
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Default 1/2 oz or 3/4 oz glass

Where do you get your fiberglass from? I'm looking for 40-50 yds of 1/2 oz (hard to find at a good cost) or should I just get the (easy to find) 3/4 oz and live with it?
This is for a few jobs I got going (mine and friends 111.5" B-24D Liberator and my 1.20 TF Gold P40E)

thanks a bunch
love all the info on this site!!

JIMFC3
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Old 01-08-2007, 10:52 PM
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Newc
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Default RE: 1/2 oz or 3/4 oz glass

http://www.sigmfg.com/cgi-bin/dpsmar...FV4.html?E+Sig

I got mine at LHS
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Old 01-09-2007, 05:13 PM
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Default RE: 1/2 oz or 3/4 oz glass

50 Yards of the 3/4 oz. for $75 bucks is going to be hard to beat.

http://www.thayercraft.com/Style%20106.htm

Tom
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Old 01-09-2007, 07:18 PM
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Default RE: 1/2 oz or 3/4 oz glass

I know thats why i'm asking what you guys think. is the 1/2 oz really worth it to only save about 1 pound??
WHAT ARE YOU GLASSING WITH 1/2 or 3/4 ?????? BTW I found 50 yds of 1/2 oz for $160...is this the best price it can be found???
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Old 01-09-2007, 07:27 PM
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Default RE: 1/2 oz or 3/4 oz glass

jimfc3,

I use .60 and/or .75 depending on what my LHS has. I like .60 for all of my 40 and 60 size models I prefer .75 when it comes to my GS warbirds. I'm not sure that it really matters, the cloth is there just to give the resin something to stick to. I just ordered some 1.1 today for my GS Corsair. I decided to try it since I already have 1 done in .75 cloth. I'll weigh them on a digital scale and tell you what the weight difference is.

David
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Old 01-09-2007, 07:52 PM
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Default RE: 1/2 oz or 3/4 oz glass

That's 3/4 oz per square YARD. Nearly all the weight build up is due to poor technique of applying the resin. If anybody tells you to put it on with a brush and remove the excess with a roll of toilet paper, ignore them.
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Old 01-09-2007, 07:59 PM
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Default RE: 1/2 oz or 3/4 oz glass

ORIGINAL: jimfc3

I know thats why i'm asking what you guys think. is the 1/2 oz really worth it to only save about 1 pound??
WHAT ARE YOU GLASSING WITH 1/2 or 3/4 ?????? BTW I found 50 yds of 1/2 oz for $160...is this the best price it can be found???
A pound? What are you glassing that will make this kind of difference? To get a covering to come in at 16 oz. over what you would get with .5 oz. cloth, you must be talking a HUGE airframe. With that size in mind, why are you looking at .5 oz. anyway? It will not be NEAR strong or stiff enough to make a project that size work.

Tom
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Old 01-09-2007, 08:22 PM
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Default RE: 1/2 oz or 3/4 oz glass

tomcat 104
you are adding .35 oz per yard of material used. --example--if you use 3 yrds you will add 1.05 oz plus the extra oz's of resin needed to "wet out" the thicker material.
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Old 01-09-2007, 08:26 PM
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Default RE: 1/2 oz or 3/4 oz glass

A pound? What are you glassing that will make this kind of difference? To get a covering to come in at 16 oz. over what you would get with .5 oz. cloth, you must be talking a HUGE airframe. With that size in mind, why are you looking at .5 oz. anyway? It will not be NEAR strong or stiff enough to make a project that size work.

Tom

oopppss brain fart [:@] I meant oz
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Old 01-09-2007, 11:08 PM
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Default RE: 1/2 oz or 3/4 oz glass

jimfc3,

That's what I was wodering. How much MOREresin would I have to use. The weight of the cloth was easy to figure out, the weight of the resin is not so easy to calculate. I'm guessing the total wight gain will be around 4 oz. What do you think?

David
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Old 01-10-2007, 05:45 PM
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Default RE: 1/2 oz or 3/4 oz glass

I use the lighter 0.56 oz./sq yd glass over vacuum bagged balsa sheeted wings, etc. to provide a good surface for painting (using Minwax polyacrylic, not epoxy resin). The heavier isn't needed for this, but may be for places where you are using the glass for adding strength, such as over the foam without balsa sheeting, in which case some use two layers of the 0.75.
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Old 01-10-2007, 07:38 PM
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Default RE: 1/2 oz or 3/4 oz glass

That's what I was wodering. How much MOREresin would I have to use. The weight of the cloth was easy to figure out, the weight of the resin is not so easy to calculate. I'm guessing the total wight gain will be around 4 oz. What do you think?

David
I can only guess on how much material was used but I would think the total extra weight should be around 2 oz-3 oz max
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Old 01-10-2007, 07:59 PM
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Default RE: 1/2 oz or 3/4 oz glass

jimfc3,

I would be VERY happy if you are right. 2oz-3oz would be great. I post my results here, I have a digital scale that is accurate to the thousandth of an ounce. It may be later in the month before I finish the job and get the weight.

David
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Old 01-11-2007, 10:07 PM
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Default RE: 1/2 oz or 3/4 oz glass

thanks david
I would like to see that.
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Old 01-12-2007, 02:39 PM
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Default RE: 1/2 oz or 3/4 oz glass

JIMfc3,

50 yards for $75 is a pretty darn good price. I mostly get mine from [link=http://cstsales.com/fiberglass.html]CST[/link], they have varying weights and widths and lengths. They are also a good supplier of carbon fiber if you ever need that. They carry a TON of other materials that I haven't used ............... yet!
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Old 01-12-2007, 11:06 PM
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Default RE: 1/2 oz or 3/4 oz glass

wow that cst has some high prices
i can get .6 oz 50" PW for $3.33 per yrd and they have it listed at $8.34 for orders OVER 25 yds...heck cst has a 5 yrd pack for $73.25 and my local hobby store has the same for $43.50
well someone has to make all the money!!
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