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Post by sf2 on Apr 5, 2009 16:42:04 GMT 10
If you mould is not so purrfect and yoou decide to paint the end product who cares what colour gel you use. I thought A nice red model would be good, but end result not so good, so have to bog and sand and paint.Again with the gel I did a hot gel and a cool resin in the cloth. I thought one coat would be ok but not so maybe two thinner layers, and it's a challange to keep it on the vertical of the mould and get a consistent layer on the mould.
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Post by sf2 on Apr 5, 2009 16:43:03 GMT 10
I'll go and edit those pics a bit later, now I've figured it out.
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Post by sf2 on Apr 5, 2009 16:47:16 GMT 10
If you look carefully at the gel around the canopy you will see a little ridge line, this is to fit the canopy and to make a recess(see later pics) for it.I used a small sized electrical gable I gooped on to the mould. This one was a bit bigger than needed so will use a smaller size next time. Here's the lay up
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Post by sf2 on Apr 5, 2009 16:53:46 GMT 10
I used what I had some 6 oz glass layer one against the gel, 95gm carbon on top and another layer of cloth over that. I then Made a resin mix(using 8 % hardner to resin) and coated it onto the cloth, i just used a brush to stipple(force the resin into cloth) and it seemed to work ok, Steve W from RC groups suggested a parsley cutter to really do the job. What the heck are all those holes you've been wanting to ask, well they're bolt holes to hold the two halfs together whilw it all dries.
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Post by chamm37 on Apr 5, 2009 18:06:56 GMT 10
BLOODY AUSOME!!!!!!! ;D ;D ;D Been waiting for one of us blokes to do this and now you have mate, thanks for doing this thread like Andrew said.....Some of us will be doing this soon ;D Regards, Chris ;D
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Post by sf2 on Apr 5, 2009 19:22:29 GMT 10
Tx's chamm, obviously this is a beginners view point, I know there are a few blokes out there who do this all the time, so hopefully they will chip in with ideas and comments and we can come up with an almost definitive plan to do these things.
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Post by sf2 on Apr 5, 2009 19:43:39 GMT 10
So on with the thread. The next step is to lay up the cloth/ carbon or combo there of. I'll describe what I did and things I wish I did different. 1)So I only did one layer of thickish gel, wish I did two thinner ones. 2)Put the cloth on while the gel was 3/4 set, not to much of a problem, just make sure it is 3/4 set and dont push it into the gel to much, othewise it will come out the other side 3) once it was 3/4 set I tried to cut the surplus cloth off, really wish I had a sharper knife, really wish I hadn't had any surplus cloth. As I cut the cloth carbon combo, the top layer of cloth came off the carbon, doh doh doh, a sharper knife might have done the trick tho. Needless to say you couldn't cut below the level of the moulds horizontal bit before it drops into the mould proper. This causes a problem because then you get stringy bits that can and apparently do go anywhere they feel when you put the two halfs together. The skill here is to cut your cloth so it stops about 5mm(so fine I know) or so, short of the top edge of the mould all the way round, wont this create a weak join, well when you join the 2 halfs you run a joining strip( which is quite tricky along the joins. Really wish I'd known that before I started. I've only seen a couple of moulded models and they all seem to have joining seem lines, my movie guy mate suggests the following. 1)Do your lay up with the short cloth and bolt together.Then use the gel you use in the first place and run it down the seem line and let dry. 2)Then mix some resin and brush the seem line and lay some cloth on it, depending on how strong you want depends on how much cloth you use, I used 4oz and carbon. This is not easy and requires some thought and some practise before you start with the resin, otherwise you'll make an unholy mess get annoyed and have a bad day with resin all over the shop, yes that's how it went for me.
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Post by sf2 on Apr 5, 2009 20:11:42 GMT 10
This is what it looks like in the mould. , ,
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Post by sf2 on Apr 5, 2009 20:22:43 GMT 10
If you look carefully into the canopy you will see a bit of a white line as you will down the tail end. This was the result of trying to trim excess cloth and not doing a good job. Did I mention that it's best not to have the cloth above the edge of the mould ??, just don't do it man just dont. So what happened was that the surplus cloth was inside the model to be and outside and the only out side place to go is between the mould halfs, this leaves a less than snug gap between halfs and when you do the join any surplus resin soaks through the cloth then down through the seem and sticks the 2 halfs together as it sets, of course you are blissfully unaware till seperation. As I joined the two halfs together all in the space of about 4-5 hours nothing was completely set. This as far as I can see doesn't matter solong( hahaha doh) you dont have stringy bits of cloth sticking out, which can embedd into the gel and cause you to get a resut like this.
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Post by sf2 on Apr 5, 2009 20:34:44 GMT 10
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Post by sf2 on Apr 5, 2009 20:40:30 GMT 10
with this one I can bog up the errors and sand down and make it work, on the photo that looks like it's full of ripples it isn't. I'm setting upfor the next one and if that goes well, well.....i might just make a jart.(just about 4 years behind schedule)
please ask questions if you want and add info that you discover the more the merrier.
All I need now is some one to volunteer a mould wing thread.
Cheers for now. Dickon
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Post by sf2 on Apr 5, 2009 20:43:59 GMT 10
PS It's fibre glass and resin WEAR GLOVES AND A MASK
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Post by sf2 on Apr 14, 2009 20:16:59 GMT 10
So i tried another lay up, this time with the cloth short of the top of the mould, then I joined the two halfs and let it set.Fill the joi line with gel coat and a strip of glass cloth. Then when tacky use a carbon or heavy cloth to join along the strip.Wet it out first. Two tips here, only use enough resin to wet the cloth, more is not strongr or better. 2nd one just join at easy spots, ie canopy and tail, take out of mould, cut wing slot and use this for access to do a better easier job of joining strip.
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