Mould for air intake

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Mould for air intake

Mould for air intake

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Barnsley-Bill	B Barnsley-Bill posted 7 Years Ago HOT Topic Details
B Group: Forum Members Posts: 25, Visits: 489	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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Barnsley-Bill	B Barnsley-Bill posted 7 Years Ago HOT Post Details
B Group: Forum Members Posts: 25, Visits: 489	+x Barnsley-Bill - 12/13/2018 10:02:09 PM 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 end without ripping it with my fingers I filled the dent/hole with Black epoxy filler then gave it a thin coat of clear.
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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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