Are you madabout kit cars      
 "We've Got Kit Cars Covered" Information about Madabout-Kitcars.com Contact Madabout-Kitcars.com         Home of UK kit cars - madabout-kitcars.com Various kit car write ups All the latest kit car news Kit car related and general discussion

Search
Manufacturers
Kit Cars
Kit Car Data sheets
Picture Gallery
SVA Knowledgebase
Clubs & Communities
Build cost estimator
Kit cars for sale
Knowledge Base 
KitcarUSA.com
Classic-Kitcars.com
 

Go Back   Madabout Kitcars Forum > Mad Build Area > Vintage and Classic Roadster Kit Car Builds

Vintage and Classic Roadster Kit Car Builds For Vintage and Classic era kit cars. Post your build reports, problems and progress here

Reply
 
Thread Tools Display Modes
  #161  
Old 7th July 2019, 21:46
Mitchelkitman Mitchelkitman is offline
Senior Member
 
Join Date: Oct 2013
Location: norfolk
Posts: 454
Mitchelkitman is on a distinguished road
Default

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
Reply With Quote
  #162  
Old 7th July 2019, 22:27
molleur molleur is offline
Senior Member
 
Join Date: Jun 2015
Posts: 1,081
molleur is on a distinguished road
Default

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.
Reply With Quote
  #163  
Old 8th July 2019, 06:35
Colin HD Colin HD is offline
Senior Member
 
Join Date: Mar 2017
Posts: 106
Colin HD is on a distinguished road
Default

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.
Reply With Quote
  #164  
Old 8th July 2019, 06:40
Colin HD Colin HD is offline
Senior Member
 
Join Date: Mar 2017
Posts: 106
Colin HD is on a distinguished road
Default

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.
Reply With Quote
  #165  
Old 8th July 2019, 06:44
Colin HD Colin HD is offline
Senior Member
 
Join Date: Mar 2017
Posts: 106
Colin HD is on a distinguished road
Default

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.
Reply With Quote
  #166  
Old 8th July 2019, 09:09
Mitchelkitman Mitchelkitman is offline
Senior Member
 
Join Date: Oct 2013
Location: norfolk
Posts: 454
Mitchelkitman is on a distinguished road
Default

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.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +0. The time now is 10:25.

copyright madabout-kitcars.com 2000-2019
terms and conditions | privacy policy