RC bumper mold

Visual Styling, Spoilers, and rims

RC bumper mold

Postby zero06 » Sat May 17, 2014 9:57 pm

I recently aquired another alltrac, since I already have an RC bumper I was considering making a mold and replicating it.
what material should I use? there is the obvious fibreglass and carbon fiber, but will they be too brittle? Is there a material II could pour into a mould or over a carbon or fibreglass part?
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1991 White st185 eternal project
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Re: RC bumper mold

Postby soarer.jzz30 » Sun May 18, 2014 12:02 am

There is a make your own body kit thread on mr2oc that has a guided process of molding. Usually it's plastic reinforced fiberglass. (frp) you'll need to order some flexible plastic made for injection molding, like for movie props and model car stuff. Then reinforce the rear with glass
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my build thread: http://alltrac.net/phpBB2/viewtopic.php?f=44&t=38003
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Re: RC bumper mold

Postby DeeCee » Sun May 18, 2014 12:57 am

you'll want to make a plug and then a mould.
Plenty of tutorials on youtube for split part moulds e.g. https://www.youtube.com/watch?v=b0iV9vEVaRM

You will want to make the mould from fibreglass with a gelcoat surface. Lots of prep, materials and time to do it right. No easy way to do it apart from a split mould IMO as there are a number of vent cavities to mould into the final part.

It sounds like you want to soft cast the bumper. Consider the size of the piece and the propensity of a soft cast to deform or get out of shape the larger the piece. A cupcake mould or cake mould is relatively small and uses the weight of the cake mix to evenly spread and hold the shape of the mould.

But a bumper is required to be hollowed out behind, so when the fibreglass is moulded into the plug, then the plug should be a solid shape to ensure the fibreglass is not deformed initially.

Say if you wanted to use plaster of paris or spray foam, then you'd need to consider the finish of the plug before application of the fibreglass. If you moulded into such a plug, you'd have to do a fair amount of finishing once the fibreglass shape has cured due to the poor surface of the plug.

There are pros and cons of doing everything, but at a minimum, make sure you have proper safety equipment such as gloves, googles/glasses and a quality dust/fume respirator as f/g and carbon dust is toxic and dangerous.

FYI - I am about to mould my RC bumper and bonnet soon so have been going through the options recently on the 'how to'. Happy to answer additional questions as I have used F/G for a number of years. Moulding is kinda of new to me, but not that big a deal either :)
GT Four Adovansu "I want to enjoy the powerful and nimble agility behavior."

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