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Vintage and Classic Roadster Kit Car Builds For Vintage and Classic era kit cars. Post your build reports, problems and progress here |
7th July 2019, 21:46
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Senior Member
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Join Date: Oct 2013
Location: norfolk
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I'd like to ask about the body fabrication......... 1)Did you use Casting Plaster (I believe this is plaster of Paris)?
2)I've done some googling, but can't find an answer... Is the CP liable to crack if it's too thin (or indeed too thick)?
I'm thinking that using Celotex foam covered with a thin layer of CP could be a good way to make a buck to take moulds off (I understand it would have to dry about 3 weeks and then be coated with shellac or poly varnish to seal, and then waxed to take moulds off)
3) Did it take many, many hours to achieve the good finish you've got using GRP over the casting plaster - did you have to fill/flat much? - I can see the appeal of the method for a one-off because it avoids the cost of moulds
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7th July 2019, 22:27
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Join Date: Jun 2015
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Just a small hijack to the thread.
I have used Hydrocal plaster (not CP) over mesh, or even drywall "mud" and screed it to about 1/8 inch to 1/4 inch thick. Sand as smooth as you can and apply a single layer of GRP cloth and finish using fillers, etc. Way away (I also use sprayed-on PVA for "belt and suspenders" mold release. Lots of time spent.
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8th July 2019, 06:35
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Join Date: Mar 2017
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Hi Guys,
I used normal multifinish wall plaster, left over from repairing a kitchen wall.
Changed to a bag of 'bonding' later, as it bulks up better.
The plaster is mixed with vermiculite granules, at a ratio of 30/70 plaster/vermiculite.
The vermiculite is only there to make it lighter, otherwise just plaster would weigh in at about 2 ton!!!
Cold weather, mix with hot water to speed-up the setting.
Place on with a normal trowel, finish off with a surform file and run over it with some 60 grit.
There really is no point it making it any smoother than that. Don't forget, you are finishing the outside of the f'glass NOT the plaster!
Slap on some latex paint & PVA, I mixed about 20% PVA into the paint.
I didn't wait for the plaster to 'fully' dry, as long as its 'crusty' on the outside, go for it!
Cover in f'glass, I used 3 or 4 layers, more in some places.
I loaded up with layers, giving me plenty of 'meat' to sand back on.
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8th July 2019, 06:40
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Join Date: Mar 2017
Posts: 127
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Casting Plaster - £20 bag
Bonding Plaster - £6 bag
I used the bonding/vermiculite at abound 1" thick over sheets of polystyrene, with no issues.
As long as the resin doesn't touch the polystyrene, you will be ok.
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8th July 2019, 06:44
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Join Date: Mar 2017
Posts: 127
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All I wanted was a one-off body, never done the whole multiple moulds thing.
I guess you would need more care to prevent movement/flex in the original buck, to ensure consistency.
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8th July 2019, 09:09
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Join Date: Oct 2013
Location: norfolk
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Thanks for the insight. I'm reassured that the bonding plaster didn't crack - although I guess it doesn't when put onto walls
I admire yous work and the car looks a hoot - I look forward to seeing it if you get it to Stoneleigh next year.
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30th July 2019, 06:30
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Join Date: Mar 2017
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30th July 2019, 06:43
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Join Date: Jan 2014
Location: Egham, Surrey
Posts: 1,780
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Mad but brilliant.
Wish I could see the MOT testers face when it pulls up.
Great work.
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30th July 2019, 07:03
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Join Date: Apr 2011
Posts: 282
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Why wouldn't you win first prize? It is fantastic! I would love to see the Red Air hostess types try to get in, and then out again, snarf snarf!
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30th July 2019, 08:36
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Join Date: Dec 2011
Location: Devon
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Totally 'bonkers' but in a good way!
I bet the MOT testers manual was well thumbed during that test.
Great Job enjoy.
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30th July 2019, 09:57
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Enthusiast
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Join Date: Mar 2005
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Congratulations, fantastic build, well done
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30th July 2019, 10:12
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Join Date: Mar 2017
Posts: 127
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Cheers Guys!!!
It is a little bonkers.
There's a Manual for the MOT!!??!!
Wish you had told me!
Actually passed quite easily:
Was tested without the bubble, so no wipers, demisters. plus I can drive with it up, so can see under - wipers not required.
Has removable front mudguards that take a couple of mins to bolt on.
Running what is often known as a 'daytime' MOT, so no lights.
Has 3-point seatbelts, that are unclipped & hidden behind the seat.
Rear indicators are 'slightly' hidden, so will eventually change those.
But it actually is MOT exempt, being 1971 VW chassis.
Last edited by Colin HD; 30th July 2019 at 13:20..
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30th July 2019, 18:33
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Join Date: Mar 2013
Location: Gloucester
Posts: 247
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Love it - but there’s no way you can claim it’s VHI (and MOT exempt) with those changes to the body (one of the specific changes that the guidance mentions)
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30th July 2019, 19:06
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Join Date: Mar 2017
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As with a lot of things, you would think so, but the Historic Vehicle - MOT exempt, make no mention or concern of the body (chassis cars only) the 'substantial changes' are linked to:
Chassis
Axles & running gear
Engine
None of which I have changed.
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30th July 2019, 19:31
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Join Date: Mar 2013
Location: Gloucester
Posts: 247
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https://assets.publishing.service.go...e-guidance.pdf
In addition if a vehicle (including a motorcycle):
• has been issued with a registration number with a ‘Q’ prefix; or
• is a kit car assembled from components from different makes and model of
vehicle; or
• is a reconstructed classic vehicle as defined by DVLA guidance; or
• is a kit conversion, where a kit of new parts is added to an existing vehicle, or
old parts are added to a kit of a manufactured body, chassis or monocoque bodyshell changing the general appearance of the vehicle;
it will be considered to have been substantially changed and will not be exempt from MOT testing.
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30th July 2019, 19:45
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Join Date: Mar 2017
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Quote:
Originally Posted by scimjim
https://assets.publishing.service.go...e-guidance.pdf
In addition if a vehicle (including a motorcycle):
• has been issued with a registration number with a ‘Q’ prefix; NO its on original J reg
• is a kit car assembled from components from different makes and model of
vehicle; NO its all VW same make & model
• is a reconstructed classic vehicle as defined by DVLA guidance; NO not reconstructed.
• is a kit conversion, where a kit of new parts is added to an existing vehicle, NO not a Kit Car as per DVLA guidance.
old parts are added to a kit of a manufactured body, chassis or monocoque bodyshell changing the general appearance of the vehicle; NO old parts have not been added.
it will be considered to have been substantially changed and will not be exempt from MOT testing.
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30th July 2019, 19:48
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Senior Member
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Join Date: Mar 2013
Location: Gloucester
Posts: 247
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Different bodies on separate chassis vehicles was specifically discussed during the consultation - they may not have written it very well but that’s exactly what it means.
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31st July 2019, 07:55
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Join Date: Feb 2012
Location: Wembley, London
Posts: 5,058
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Colin - First of all, congratulations on your first award.
And secondly...
Quote:
Originally Posted by scimjim
Different bodies on separate chassis vehicles was specifically discussed during the consultation - they may not have written it very well but that’s exactly what it means.
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Sorry ScimJim, but I also follow Colin's interpretation of the VHI rules.
There were a number of things discussed in the consultation, including increases in power/weight ratios, but these are now red herrings.
It is the final official wording that counts and that does not prevent a new body on an old chassis.
The fact the wording is vague should count in our favour.
E.g. "The general appearance" is still that of a car, as it hasn't been changed into a truck.
Cheers, Paul.
PS
More debate on VHI here:
http://www.madabout-kitcars.com/foru...light=historic
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31st July 2019, 09:17
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Join Date: Mar 2013
Location: Gloucester
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We’ll agree to disagree until a test case comes up then
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31st July 2019, 17:44
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Join Date: Jul 2011
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Hmm, as Paul (and others) have already been granted VHI status with cars that have been previously and properly declared as re-bodied, it does appear that the authorities' view is that they still qualify as historically interesting vehicles, which is nice.
Having said that, I'll still be presenting anything I build for an annual inspection to my MOT chappy just for the peace of mind of it having an independent safety inspection, and I suspect a lot of builders on here will do the same.
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