Comparative Strength?

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bigc33

Member - Posts: 4

Joined: August 28, 2006

Location: Canada

Posted: August 28, 2006 at 12:24 AM / IP Logged

After reading through about 25 pages in the fiberglassing part of the forum I have a few questions of my own that hopfully you guys can help me with.

1. Will fiberglass mat or cloth be stronger for impact strength (not rigidity) when used on a smooth evenly curving surface?

2. Are there any spray on products that can be used to:

a) make a high even, and smooth build that are reasonably rigid?

b) make a rigid negative mold that will have a smooth interior surface and easily be used as a negative mold without much bondo/sanding work?

3. What type of plastic should be used in a vac bag setup for the interior porous bag and for the exterior bag?

Thanks a bunch for any help you can provide!

Evan

jlord16

Silver - Posts: 322

Joined: September 08, 2005

Location: Australia

Posted: August 28, 2006 at 3:30 AM / IP Logged

matting is generally stronger in all applications then the cloth/weave type, as for question 2 and 3 im sure someone else will help you

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bigc33

Member - Posts: 4

Joined: August 28, 2006

Location: Canada

Posted: August 28, 2006 at 10:42 AM / IP Logged

k so here's the tally so far

mat = 1

cloth = 0

I was personally thinking that for Impact strength cloth would be stronger so I would like as many opinions (preferably educated ones) as possible.

Thanks

cutlass013

Copper - Posts: 95

Joined: July 27, 2006

Location: United States

Posted: August 28, 2006 at 3:15 PM / IP Logged

it depends on the weight (oz) of the material your using personall i thing for waht your talking about the woven or cloth i guess would be stronger the mat is just a bunch of little chopped up glass put together thinly its like pulling apart a t-shirt ir a cotton ball wich is harder the shirts...just my opinion

bigc33

Member - Posts: 4

Joined: August 28, 2006

Location: Canada

Posted: August 28, 2006 at 3:44 PM / IP Logged

Well I found some info on the net and it looks like Cloth wins this round. It is stronger on a per weight basis after resin. Since mat absorbs more resin it is stronger per mat weight after resin is absorbed. Cloth will be stronger but also requires more layers. I am also looking into the use of Carbon Fiber and Kevlar. Kevlar has the best impact strength but worst tensile strength. I figure a combination of S2 glass for rigidity, Carbon Fiber for looks, Kevlar for peircing strength and glass mat for build will be best.

Anyone have answers to the 2nd or third questions?

Melted Fabric

Silver - Posts: 509

Joined: October 24, 2003

Location: California, United States

Posted: August 29, 2006 at 2:09 PM / IP Logged

1. Will fiberglass mat or cloth be stronger for impact strength (not rigidity) when used on a smooth evenly curving surface?

Fiberglass gains it's strength not only from curves but also in the number of layers applied to your piece.

2. Are there any spray on products that can be used to:

a) make a high even, and smooth build that are reasonably rigid?

Not sure I understand the question.

b) make a rigid negative mold that will have a smooth interior surface and easily be used as a negative mold without much bondo/sanding work?

For that, instead of re-inventing the wheel, I will direct you to read MOLD CONSTRUCTION

3. What type of plastic should be used in a vac bag setup for the interior porous bag and for the exterior bag?

Also, while you there look at this link. The product you are looking for is called bagging film. Vacuum Bagging Equipment & Techniques

I have not failed. I've just found 10,000 ways that won't work.

When you do not know what you are doing and what you are doing is the best -- that is inspiration.

bigc33

Member - Posts: 4

Joined: August 28, 2006

Location: Canada

Posted: August 29, 2006 at 2:13 PM / IP Logged

Thanks a bunch....for the second one, I am looking for esentially a stiff silicone that can be used from a spray apperatus.

Melted Fabric

Silver - Posts: 509

Joined: October 24, 2003

Location: California, United States

Posted: August 29, 2006 at 2:19 PM / IP Logged

I can't but think of the scene from ghost busters II where they use the "goo" and hose down the bad guy with it.

Well, I have no clue other than getting a little crazy and mixing up a batch of resin with hardner in it, throw it into an old spray gun and risk ruining the spray gun.

Hopefully someone has a better idea.

Although the ghost buster thing might work if you can find the same goo.

I have not failed. I've just found 10,000 ways that won't work.

When you do not know what you are doing and what you are doing is the best -- that is inspiration.

xtremekustomz

Member - Posts: 29

Joined: August 09, 2006

Location: United States

Posted: August 31, 2006 at 9:35 PM / IP Logged

bigc33 wrote:

After reading through about 25 pages in the fiberglassing part of the forum I have a few questions of my own that hopfully you guys can help me with.

1. Will fiberglass mat or cloth be stronger for impact strength (not rigidity) when used on a smooth evenly curving surface?

2. Are there any spray on products that can be used to:

a) make a high even, and smooth build that are reasonably rigid?

b) make a rigid negative mold that will have a smooth interior surface and easily be used as a negative mold without much bondo/sanding work?

3. What type of plastic should be used in a vac bag setup for the interior porous bag and for the exterior bag?

Thanks a bunch for any help you can provide!

Evan

On number 2 are you actually wanting to make a mold? If so you will have to make your form and probably have to do alot of sanding on it and possibly paint it to get a really smooth surface. After that you can use a mold release and gelcoat for your initial layers inside the mold them add fiberglass matt and resin. I don't know if that answered your question or not but it was worth a shot.

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: August 31, 2006 at 10:11 PM / IP Logged

Melted Fabric wrote:

Although the ghost buster thing might work if you can find the same goo.

Isn't it called ectoplasm?

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