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Old 03-27-07, 05:01PM   #16
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I was woundering why you were making the Hood. I didn't think about shipping.
Yup shipping is the killer almost $350 plus the hood then add tax and duty and its about $700 ish

I reckon we have about $150 in materials and that includes making the mould. The other reason is if i happen to have a little accident we can make another hood.
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Old 03-27-07, 05:12PM   #17
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So how thick is the gel coat applied? can you do multiple layers of gel coat to allow for smoothing the mold or multiple layers on the finished part for the same smoothing reason? I'm guessing the finished part gets gelcoated also, right?
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Old 03-27-07, 05:20PM   #18
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So how thick is the gel coat applied? can you do multiple layers of gel coat to allow for smoothing the mold or multiple layers on the finished part for the same smoothing reason? I'm guessing the finished part gets gelcoated also, right?
I reckon we got between a 1//16th and a 1/8th of thickness on the gelcoat. As mentioned above you can spray it but for the first atempt we didnt.

Im not sure if you can build mutiple layers of gelcoat

When the mould is finished im thinking of filling any holes with 2k filler and then highbuild primer and wet flat the whole thing to make sure the mould is smooth.

When we lay up the hood we will lay a coat of PVA then the gelcoat and start the layup again with the cloth.

As this is for a race car im not to bothered if there are a few imperfections in the finish, i will probably high build and paint it at a later date
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Old 03-27-07, 08:12PM   #19
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OK, for those who don't know what PVA is?
I like this post, learnin alot here.
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Old 03-27-07, 08:25PM   #20
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OK, for those who don't know what PVA is?
I like this post, learnin alot here.

Your not the only one mate, pretty much everything i am learning i am doing so during this build up.

Quote:
Polyvinyl Alcohol PVA
This easy to use liquid release agent can be brushed sponged or sprayed onto the mould surface and allowed to dry. It is supplied with blue tint to clearly show which parts of the mould are covered. Sometimes PVA is applied to mould which has also had a wax release agent applied. These waxes should be silicone free and all residue of wax removed to avoid separation of the PVA. Water can be used to aid release. Moulds should be washed and dried before re-use.
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Old 03-27-07, 09:26PM   #21
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Very interesting.
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Old 03-31-07, 12:28PM   #22
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That's what I'm waiting for.

(Oh yeah - the gelcoat should be able to be sprayed just like any other primer or paint, you may need to thin it out, and it may take multiple layers to build it up to the thickness you want...just like any paint work. If brushing it on works as well, that'd probably be a lot less hassle.)
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Old 03-31-07, 09:00PM   #23
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Ok here are the pictures from today, we didnt get a lot done as the materials we ordered didnt get delivered.

The pictures below show the blocks of MDF we added to build the frame structure on. After a lot of thinking this was decided to be the best way we could think to add the support.

The Blocks are 4.5" x 4.5" 3/4 MDF with a 45˚ bevel on all 4 sides. We first layed down some CSM then set the blocks on top moving them around to set them in place.

When the resin had hardened we then covered the blocks with some 300g/m cloth.

Next week we will build up the mould with multiple layers of CSM add the frame work and try to remove the mould from the hood
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Old 04-07-07, 04:10PM   #24
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Well today was a good day, we finaly finished up the lay up and even managed to pull the mould

The first pic is the 2 layers of CSM we added to build up the mould thickness.

The following pictures show the CSM after it has been rolled to remove air bubbles from the lay up

After the mould had set we added the MDF ribs before we removed the mould from the original hood
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Old 04-07-07, 04:13PM   #25
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Default The finished mould

Ok last few pictures

First is the mould as we try to remove the original hood, this was pretty easy with the use of an airline

Next is the finished mould with only a couple of minor imperfections

Finalis the original hood show no sign of any damage after being used as a mould plug
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Old 04-08-07, 10:49AM   #26
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pretty good stuff, check my project out....
First the plug, then the tooling gel, then laying up the glass..............
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11:89 @ 111.66 Mph, all throttle, no bottle.......
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Old 04-08-07, 02:57PM   #27
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Nice work!
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Old 04-08-07, 03:20PM   #28
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How are you guys going to cure the resin on the finished product
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Old 04-08-07, 05:04PM   #29
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How are you guys going to cure the resin on the finished product
The last pic you see in my post, the black hood, is the first one out of the mold. We layed it up using about 2% MEK in the resin, that was after a coat of PVA then a coat of gel sprayed into the mold.
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Old 04-08-07, 09:03PM   #30
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Nice work jeff, this is the first time either myself or my buddy had done any major glass work.
We already decided that we would do a little more prep to the plug on the next mould we make.
It looks like you extended the side of your plug which is something we should have looked at doing.

We will try and make our first hood next weekend and see how it works out
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