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| Italian Replica builds and chat Lamborghini, Ferrari, Lancia, any Italian replica car build and chat |
20th January 2021, 15:31
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Junior Member
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Join Date: Nov 2012
Posts: 6
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Thank you for the suggestion. What coating do you have to use before applying polyurethane resin and matting etc?
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20th January 2021, 15:46
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Senior Member
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Join Date: Jun 2015
Posts: 1,401
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that would depend upon if you intend to make a mould or simply a male one-off body which will require a lot of post-finishing.
If making a mould, a very fine finish is needed. Should you make your body buck and use it as a final product, it will be much more labor intensive to finish. Send me a PM for a more detailed and lengthy explanation.
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8th February 2021, 16:52
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Senior Member
Enthusiast
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Join Date: Mar 2008
Posts: 225
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https://rqriley.com/fiberglass-over-foam/
Robert Q. Riley describes using polyurethane foam - which has a very fine grain and is not melted by standard polyester fibreglass resin. Polyurethane foam used to be readily available in insulation supply companies - I'm not sure if it still is.
Polystyrene foam is much more coarse and doesn't cut or sand in the same way. You can use a different, more expensive fibreglass resin (epoxy) to avoid melting polystyrene.
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19th April 2021, 15:48
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Senior Member
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Join Date: Oct 2013
Location: norfolk
Posts: 692
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Quote:
Originally Posted by rossnzwpi
https://rqriley.com/fiberglass-over-foam/
Robert Q. Riley describes using polyurethane foam - which has a very fine grain and is not melted by standard polyester fibreglass resin. Polyurethane foam used to be readily available in insulation supply companies - I'm not sure if it still is.
Polystyrene foam is much more coarse and doesn't cut or sand in the same way. You can use a different, more expensive fibreglass resin (epoxy) to avoid melting polystyrene.
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Just use polyisocyanurate board (trade call it PIR) Cellotex or similar - just peel off the foil off one side and paper off t'other (it really stinks when you do it!)
Works well with polyester resin. Also builders 'squirty foam' is useful and can be used to fill gaps or join boards. |
26th October 2022, 20:05
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Senior Member
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Join Date: Feb 2016
Posts: 112
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Hey Lucky,
I have sent you a PM but your in box is full so it won't accept it. If you get a min ping me one back please.
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19th August 2023, 17:39
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Senior Member
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Join Date: Aug 2012
Posts: 2,146
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Quote:
Originally Posted by Lucky@LeMans
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Hmm, a bit out of my price bracket at $1,700,000 ! |
8th February 2021, 17:17
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Senior Member
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Join Date: Jun 2015
Posts: 1,401
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Should you choose to use polystyrene foam, the extra expense of epoxy resins may be avoided by (after shaping) coating the plug with latex house paint, several coats. Them applying mould release wax and PVA
to the surface. This prevents polyester resins from attacking the styrene
foam. PITA to remove the polystyrene foam should some stick to the part (some will). Easily removed with acetone in a squirt bottle. The acetone will dissolve the foam quickly. Recently did this on three complicated fiberglass parts. PITA in all.
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20th January 2021, 12:59
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Senior Member
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Join Date: Aug 2012
Posts: 2,146
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Looks like a great project. The Locost chassis wasn't modified, the track and wheel base were correct. The driving position was very short but that was due to tiny cockpit area governed by the body shape. If designing from scratch you might want to increase the space inside a little. No wheel spacers fitted but the hub adaptors do increase the track a little. Luckily on my car it all fell into position.
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