+x

 

Hanaldo - 1/9/2021 12:53:10 PM

Ok, so - you havent really experienced a release failure here, atleast not a total one. If your release hadn't worked at all, you wouldn't have been able to remove the gelcoat afterwards at all, so the fact you were able to remove the gelcoat and leave a glossy surface tells me the release agent did its job. When you have a release failure, it is absolutely impossible to remove the gelcoat. 

So what's happened here is a total adhesion failure between the substrate and the tooling gelcoat, which is somewhat more strange. The fact there was more adhesion between the released surface of the gelcoat and the carbon part than there was between the tooling gelcoat and the reinforcement is concerning.  What did you make the mould from and how did you lay it up, what was your process?

You may have had a partial release failure as well, where the release agent worked well enough to not allow the epoxy to bond to the gelcoat but not well enough to allow a very easy removal. But the fact the gelcoat came away from the mould reinforcement means that is what actually failed, and the tension between the epoxy and the gelcoat only aided in pulling the gelcoat off the mould easier.

+x

 

Massimiliano - 1/9/2021 9:06:13 PM

+x

 

Hanaldo - 1/9/2021 12:53:10 PM

Ok, so - you havent really experienced a release failure here, atleast not a total one. If your release hadn't worked at all, you wouldn't have been able to remove the gelcoat afterwards at all, so the fact you were able to remove the gelcoat and leave a glossy surface tells me the release agent did its job. When you have a release failure, it is absolutely impossible to remove the gelcoat. 

So what's happened here is a total adhesion failure between the substrate and the tooling gelcoat, which is somewhat more strange. The fact there was more adhesion between the released surface of the gelcoat and the carbon part than there was between the tooling gelcoat and the reinforcement is concerning.  What did you make the mould from and how did you lay it up, what was your process?

You may have had a partial release failure as well, where the release agent worked well enough to not allow the epoxy to bond to the gelcoat but not well enough to allow a very easy removal. But the fact the gelcoat came away from the mould reinforcement means that is what actually failed, and the tension between the epoxy and the gelcoat only aided in pulling the gelcoat off the mould easier.

Thank you Hanaldo, I can't thank you enough for the sustained support you offer in this forum!
The mould has been made with epoxy tooling gelcoat (a new epoxy tooling gelcoat never used before) and laminated with glass and laminating epoxy. I laminated the glass when the tooling gelcoat was already full cured.
For sure I will never use again thos products, and luckily Ec resumed shipping to the EU.

Now I have another mould made in same way and I need to pull another one part from it and I fear to have same issue.
What would your recommend to favor a release?

+x

 

Lester Populaire - 1/9/2021 10:29:12 PM

+x

 

Massimiliano - 1/9/2021 9:06:13 PM

+x

 

Hanaldo - 1/9/2021 12:53:10 PM

Ok, so - you havent really experienced a release failure here, atleast not a total one. If your release hadn't worked at all, you wouldn't have been able to remove the gelcoat afterwards at all, so the fact you were able to remove the gelcoat and leave a glossy surface tells me the release agent did its job. When you have a release failure, it is absolutely impossible to remove the gelcoat. 

So what's happened here is a total adhesion failure between the substrate and the tooling gelcoat, which is somewhat more strange. The fact there was more adhesion between the released surface of the gelcoat and the carbon part than there was between the tooling gelcoat and the reinforcement is concerning.  What did you make the mould from and how did you lay it up, what was your process?

You may have had a partial release failure as well, where the release agent worked well enough to not allow the epoxy to bond to the gelcoat but not well enough to allow a very easy removal. But the fact the gelcoat came away from the mould reinforcement means that is what actually failed, and the tension between the epoxy and the gelcoat only aided in pulling the gelcoat off the mould easier.

Thank you Hanaldo, I can't thank you enough for the sustained support you offer in this forum!
The mould has been made with epoxy tooling gelcoat (a new epoxy tooling gelcoat never used before) and laminated with glass and laminating epoxy. I laminated the glass when the tooling gelcoat was already full cured.
For sure I will never use again thos products, and luckily Ec resumed shipping to the EU.

Now I have another mould made in same way and I need to pull another one part from it and I fear to have same issue.
What would your recommend to favor a release?

It's best practice to work wet in wet, so laminate the reinforcement once the gel coat is firm but still tacky. I learnt to sprinkle chopped glass fibres into the gel coat to improve bonding between the layers as well. I honestly don't know how much this helps, but i never had an issue with gel coat flaking off