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Massimiliano - 10/5/2020 3:45:35 AM

Hi,
what are the scenarios where is better to use a semi permanent release agent and the ones where is better a wax?

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Lester Populaire - 10/5/2020 5:12:20 AM

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Massimiliano - 10/5/2020 3:45:35 AM

Hi,
what are the scenarios where is better to use a semi permanent release agent and the ones where is better a wax?

I use wax for surfaces that have some level of porosity (like body filler) and surfaces that are not resistant to solvents. Usually permanent releases for everything else even tho we started using formula five wax for more and more things to reduce exposure to solvents. 

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Fasta - 10/5/2020 5:50:32 AM

It's not always one or the other.

I use semi permenant release agents on all my moulds including the ones I want to use wax with. Semi perm and then wax on top too.

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Massimiliano - 10/5/2020 5:58:15 AM

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Fasta - 10/5/2020 5:50:32 AM

It's not always one or the other.

I use semi permenant release agents on all my moulds including the ones I want to use wax with. Semi perm and then wax on top too.

Thanks!
Why you add wax on top of semi permanent?

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Fasta - 10/5/2020 6:03:45 AM

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Massimiliano - 10/5/2020 5:58:15 AM

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Fasta - 10/5/2020 5:50:32 AM

It's not always one or the other.

I use semi permenant release agents on all my moulds including the ones I want to use wax with. Semi perm and then wax on top too.

Thanks!
Why you add wax on top of semi permanent?

The semi permenant gives the mould a safer release and the wax allows you to spray gel coats on to the surface as well as making for a better gloss mould finish. I use this on moulds requiring wet resin layup and I use only semi permenant when working with pre preg and oven cure cooking.

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Warren (Staff) - 10/5/2020 2:32:36 PM

The reason why wax is better as the top coat (or only release coat) for wet lay up and where gelcoats are used, is that semi-permanents can make the surface so slippery that thick gelcoats end up fish-eying and separating on the surface.  So wax "dulls" down the slippery surface a bit making it easier to get the gelcoat on.

As Fasta mentioned it is also good insurance to use 2 release agents like that.  We especially recommend it for taking moulds from patterns where you only get one chance.  PVA is even safer chance of release but it leaves surface marring meaning you need to polish the mould a fair bit to get a good surface.

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Warren (Staff) - 10/5/2020 2:32:36 PM

The reason why wax is better as the top coat (or only release coat) for wet lay up and where gelcoats are used, is that semi-permanents can make the surface so slippery that thick gelcoats end up fish-eying and separating on the surface.  So wax "dulls" down the slippery surface a bit making it easier to get the gelcoat on.

As Fasta mentioned it is also good insurance to use 2 release agents like that.  We especially recommend it for taking moulds from patterns where you only get one chance.  PVA is even safer chance of release but it leaves surface marring meaning you need to polish the mould a fair bit to get a good surface.