Mould for air intake


Mould for air intake
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Barnsley-Bill
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Barnsley-Bill
posted 7 Years Ago HOT
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Hi all I want to make a split mould for this air intake for my car out of Pre peg ' I bought the uni mould kit but have since found out its no good with the higher temps with the pre peg
Could I use the glass fiber mesh out of the uni mould kit with the high temp resin and the EG60 Epoxy Tooling Gelcoat .

or if not can you make a split mould using the tooling pre peg ?
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Mould for air intake
Barnsley-Bill - 7 Years Ago
     No on both accounts unfortunately. The chopped strand mat that comes with the Unimould needs the styrene that is in the Unimould resins, it wont work with epoxy. And you can make a split mould with.....
Hanaldo - 7 Years Ago
     Thanks Hanaldo when you say 'if you need a service temperature higher than 80C then you need to do a post-cure out of the mould , is this once its cooked in the mould remove the part from the mould....
Barnsley-Bill - 7 Years Ago
     That's it. So follow the low temp cure cycle. When that has finished, demould the part, and put it back in the oven. If you have the precision control, it is best to do a very slow ramp rate of 0.1°C...
Hanaldo - 7 Years Ago
             I would also bolt the two parts together prior to post curing, placing some release film between the flanges to remove any chance of them sticking together.
Steve Broad - 7 Years Ago
     What two parts? Surely this will be laid up as a single piece pipe?
Hanaldo - 7 Years Ago
             I believe the plan is to make a split mould along the black line.
Steve Broad - 7 Years Ago
     Yes, but he isn't talking about the mould, he is talking about the final component. If he makes the mould using Unimould then his best bet when curing the pre-preg is to follow the low temp cure cycl...
Hanaldo - 7 Years Ago
             Yeah, being stupid again!
Steve Broad - 7 Years Ago
     easy release the plug and mould 7 to 8 times and its stuck like super glue ?
Barnsley-Bill - 7 Years Ago
     Have you a photo of the finished plug for us? How did you finish the plug?
oekmont - 7 Years Ago
             sadly not mate dense foam ' body filler ' pattern coat ' high gloss coat easy lease
Barnsley-Bill - 7 Years Ago
     Is it a polyester or epoxy mould? How old is your release agent? How many applications?
oekmont - 7 Years Ago
             it was the uni mold kit ' not very old easy lease and about 7 to 8 coats of the plug and moulds ' I'm not blaming the kit it was probably me doing something wrong I didn't cure the plug in the oven.....
Barnsley-Bill - 7 Years Ago
     Is this body filler on the surface? That stuff is too porous for just a chemical mould release and needs to be sealed first with a mould sealer/primer. Cheers, Lester
SleepingAwake - 7 Years Ago
     Are you shure you didn't sand through the high gloss coat? As said before, polyester filler is a highly problematic surface to take a mould from. How did you prepare the plug surface? Sanding till...
oekmont - 7 Years Ago
     Also bear in mind that some solvent based products (and some paints) continue to outgas for some time after initial cure. The worse the outgassing the more likely it is to compromise the release agen...
Warren (Staff) - 7 Years Ago
     I've managed to remove most of the plug from the moulds and at first thought it might be a mechanical lock but if this was so would it flake off after breaking a bit . I sanded the plug with 1200...
Barnsley-Bill - 7 Years Ago
     1200 is wayyyy too fine for a pattern coating like high gloss coat. Need about 240 at the finest, preferably 180. In any case, unless the plug came out of the mould and only left the gloss coat on.....
Hanaldo - 7 Years Ago
     Unless he sprayed it, wich would be very difficult because of the short pot life, he must have sanded after the final coat. The high gloss coat gives a nice finish, but not nice enough to go directly...
oekmont - 7 Years Ago
     Agreed.
Warren (Staff) - 7 Years Ago
     No the mould flanges were ok and yes just the plug clear coat is stuck to the mould ' I'm going to sand them both then try and coat them again the best i can EDIT Found my problem I must have ordered...
Barnsley-Bill - 7 Years Ago
             You are not alone. I have used the cleaner by mistake as well. The labels, although some of the words are a different colour, are similar and it is an easy mistake to make :-)
Steve Broad - 7 Years Ago
     everyone makes mistakes in this business, and its only through learning from them you can move on! Dont worry i still muck things up and ive been doing it for a long time! :)
scottracing - 7 Years Ago
     RE: Mould for air intake
Barnsley-Bill - 7 Years Ago
             I made a new mould and this is my first go at pre peg ' I'm happy with the results but plan to make one more as one side looked like it was bridging as it was hard getting the vacuum bag in at both.....
Barnsley-Bill - 7 Years Ago

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