# identifying Fiberglass - 4oz and 6oz 

**URL:** <https://forum.clcboats.com/t/identifying-fiberglass-4oz-and-6oz/36794>\
**Category:** Builder's Forum\
**Created:** [April 26, 2010, 7:13pm UTC](https://forum.clcboats.com/t/identifying-fiberglass-4oz-and-6oz/36794 "2010-04-26T19:13:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Donald\_Clow](https://avatars.discourse-cdn.com/v4/letter/d/b3f665/32.png) [@Donald\_Clow](https://forum.clcboats.com/u/Donald_Clow)\
**Post date:** [April 26, 2010, 7:13pm UTC](https://forum.clcboats.com/t/identifying-fiberglass-4oz-and-6oz/36794/1 "2010-04-26T19:13:07Z")

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OK... this may sound like a pretty dumb question (at least to my ears)...

I have the&nbsp;Chesapeake&nbsp;17 kit, and have finally determined to complete it, (after an&nbsp;embarrassingly long hiatus).

I'm out in the shop, about to start laying out the dry 'glass on the bottom, and realized that I have no clue as to which is which. &nbsp;(fiberglass, that is)

One is quite fine and one is rather course. &nbsp;I'm&nbsp;tempted to assume&nbsp;the&nbsp;coarse glass is the 6-oz., but really don't want to assume anything...

Can someone advise?

Thanks in advance.

Donald&nbsp;

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**Author:** ![David\_Donaldson](https://avatars.discourse-cdn.com/v4/letter/d/f4b2a3/32.png) [@David\_Donaldson](https://forum.clcboats.com/u/David_Donaldson)\
**Post date:** [April 26, 2010, 8:24pm UTC](https://forum.clcboats.com/t/identifying-fiberglass-4oz-and-6oz/36794/2 "2010-04-26T20:24:04Z")

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the oz. is the weight of the fabric, per sq. yard I think… either way, the 4 oz is lighter than the 6 oz… looking at my 4oz & 6oz. the 4 is finer and thinner.&nbsp; Hope this helps.

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**Author:** ![Lee\_Edmonds](https://avatars.discourse-cdn.com/v4/letter/l/9fc348/32.png) [@Lee\_Edmonds](https://forum.clcboats.com/u/Lee_Edmonds)\
**Post date:** [April 26, 2010, 8:24pm UTC](https://forum.clcboats.com/t/identifying-fiberglass-4oz-and-6oz/36794/3 "2010-04-26T20:24:17Z")

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Your intuition is correct, the finer cloth is the 4-oz glass (for the deck).&nbsp; The 6-oz glass is the coarser stuff (for the hull).&nbsp; The finer cloth is easier to wet out, but also easier to sand through.&nbsp; Enjoy the rest of your build.

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**Author:** ![Donald\_Clow](https://avatars.discourse-cdn.com/v4/letter/d/b3f665/32.png) [@Donald\_Clow](https://forum.clcboats.com/u/Donald_Clow)\
**Post date:** [April 27, 2010, 2:14pm UTC](https://forum.clcboats.com/t/identifying-fiberglass-4oz-and-6oz/36794/4 "2010-04-27T14:14:15Z")

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Thanks David and ootdb. &nbsp;Glad I checked, just to be sure.

Pushed off the hull till this&nbsp;morning, and it looks fine....

&nbsp;

Thanks again

Donald&nbsp; ![](http://www.facebook.com/photo.php?pid=4498405&l=19d5c5ae8e&id=528986726)