How to glass - Page 2 - SailNet Community
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post #11 of 18 Old 04-10-2013 Thread Starter
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Re: How to glass

That is what I'll do then

The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
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post #12 of 18 Old 04-10-2013
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Re: How to glass

I suggest wetting it with pure epoxy first, if you are going to use any additives during your project.

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post #13 of 18 Old 04-11-2013 Thread Starter
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Re: How to glass

The reason I asked is that I've heard that cheap plywood will telegraph through the epoxy unless it has a layer of cloth.

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post #14 of 18 Old 04-12-2013
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Re: How to glass

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Originally Posted by davidpm View Post
The reason I asked is that I've heard that cheap plywood will telegraph through the epoxy unless it has a layer of cloth.
It can but it's not like paint - just put on another coat or put some filler in it.

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post #15 of 18 Old 04-12-2013
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Re: How to glass

Agreed! It probably doesn't require "glass" for protection or structural reasons.

If you do want to involve "glass" in the layer covering an irregular surface there is another option. Round all saw cut edges with a rasp. Fiberglass mat can be teased apart to a very thin "fabric" layer. Very thin is the key. One layer or filaments is very thin. Mat is chopped glass filaments held together with a seizing. When I want some fiberglass to conform to a tight radius, to add a matrix for abrasion or structural effect, I tease apart some mat and "dab" small pieces into / onto the surface with a stiff "white chip" brush. The brush is applying the resin at the same time. Addin a bit of filler to the resin helps. It is tedious but if you add small amounts of mat in several layers you can get to conform to 90 degree corners. Once a layer of this resin rich mat covering is in place a light open weave fabric can be laid on if it is done while the resin is still tacky. Pay attention to the direction of the weave in the fabric and use small pieces added on the bias. You will end up building some thickness so allow for that. Avoiding sanding is the plan. Having everything ready before you start helps, too.

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post #16 of 18 Old 04-12-2013
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Re: How to glass

If you decide to use mat, remember that most of it is held together with a styrene soluble binder. Epoxy will not dissolve it - if you are using epoxy you must get mat that is specified for that purpose - it uses a different binder.
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Re: How to glass

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If you decide to use mat, remember that most of it is held together with a styrene soluble binder. Epoxy will not dissolve it - if you are using epoxy you must get mat that is specified for that purpose - it uses a different binder.
It is correct that there are different binders. It really won't make any difference if you are using the very thin layer I am suggesting for this application. It would be an important consideration if you were trying to get a full thickness layer of mat to conform.

Thanks for keeping it accurate JonB.

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post #18 of 18 Old 04-12-2013
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Re: How to glass

You didn't say why you want to glass it. Can we assume it's for rot resistance?

Also, if you're concerned about the appearance (you said you were concerned about "telegraphing" of the cheap plywood through the mat) why not use a piece of mahogany? Prime it and paint it.

Heck of a lot easier and it will absolutely look good when you're done.
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