+x

 

AndrewL92 - 11/25/2020 12:44:18 AM

+x

 

Hanaldo - 11/24/2020 9:57:07 PM

Oh I see, no dont do that. Resin will go everywhere and make a big mess, and you will likely still struggle to get a seal due the bolt holes.

Just run your sealant tape around the perimeter of the flange as it is and try to get it to seal like that. Good chance it won't, so then I would double bag and place the entire mould inside an envelope bag. The first bag will prevent resin from going where you dont want it, while the second will provide the seal. Just watch out for puncturing the second bag on the mould or your bolts.

Perfect, then proceed as you advised me.
In this regard, I had some questions:

1. if I use gelcoat, to make a bead between the flanges, as you advised, how long do I have to wait to close the flanges together? As soon as I apply the gelcoat?
And to proceed with the infusion?
Can i use a gelcoat additive?

2. How do I seal the bolt holes? By applying the gelcot in the hole and then screwing?

3. What reinforcement do you recommend for these fenders? Would it make sense to use lantor soric?

Thanks again for your availability

+x

 

Hanaldo - 11/24/2020 9:57:07 PM

Oh I see, no dont do that. Resin will go everywhere and make a big mess, and you will likely still struggle to get a seal due the bolt holes.

Just run your sealant tape around the perimeter of the flange as it is and try to get it to seal like that. Good chance it won't, so then I would double bag and place the entire mould inside an envelope bag. The first bag will prevent resin from going where you dont want it, while the second will provide the seal. Just watch out for puncturing the second bag on the mould or your bolts.

+x

 

AndrewL92 - 11/22/2020 12:36:22 AM

+x

 

Hanaldo - 11/19/2020 12:05:18 AM

No reason why you can't use it, some of those flange shapes are going to make things challenging for you but it's certainly usable. 

You either need to seal the flanges with something before bolting them together, or you will need to envelope bag the entire thing. Envelope bagging I find quite unreliable for infusion due to the propensity for leaks, especially on larger complex moulds like this, so I try to avoid it. for sealing the flanges, the easiest and most reliable way I've found is to use an RTV silicone gasket maker (do NOT use an adhesive caulking silicone, these will bond your flanges together regardless of release agent). The downside is this is a bit difficult to clean up after the infusion, so it becomes a bit of a pain to reuse the moulds. Another way I do it is to run a 'bead' of gelcoat all around the flanges, and then bolt the flanges together before the gelcoat cures. This is significantly easier to clean up, but doesn't seal as reliably as the silicone gasket. Using either method, don't forget to seal up your bolt holes as well.

Thanks for the reply.

I understand what you said. The only doubt I have is how to arrange the taky tape all around the perimeter, without any leakage, especially where the vertical and horizontal flanges join or in other parts where there are fairly tight curves. Maybe it's my inexperience that makes me see the problem!

Another way I had thought of to proceed with the infusion was to slightly cut out the upper flanges to create a bead of a couple of cm along the entire perimeter to apply the taky tape. This way I would only have to finish the top flanges and would only need to seal the bolt holes. What do you think about it?
I hope I explained myself.

+x

 

Hanaldo - 11/19/2020 9:02:24 PM

+x

 

beliblisk - 11/19/2020 7:25:04 PM

+x

 

Hanaldo - 11/19/2020 12:05:18 AM

No reason why you can't use it, some of those flange shapes are going to make things challenging for you but it's certainly usable. 

You either need to seal the flanges with something before bolting them together, or you will need to envelope bag the entire thing. Envelope bagging I find quite unreliable for infusion due to the propensity for leaks, especially on larger complex moulds like this, so I try to avoid it. for sealing the flanges, the easiest and most reliable way I've found is to use an RTV silicone gasket maker (do NOT use an adhesive caulking silicone, these will bond your flanges together regardless of release agent). The downside is this is a bit difficult to clean up after the infusion, so it becomes a bit of a pain to reuse the moulds. Another way I do it is to run a 'bead' of gelcoat all around the flanges, and then bolt the flanges together before the gelcoat cures. This is significantly easier to clean up, but doesn't seal as reliably as the silicone gasket. Using either method, don't forget to seal up your bolt holes as well.

Regarding the sealing mould parts.

Would you say that gum tape in 2mm recess integrated in the flange works better than gelcoat method?

I used RVT silicon befor but as mentioned its a pain to clean so for next multi part tool i was planning to go gum tape route.

thanks a lot

Tried it, but didn't find it very reliable. The tape tends to compress quite easily, and it often ends up that in some areas it doesn't contact the opposite flange properly and doesn't seal. It also still makes a hell of a mess, its just as hard to clean up as the silicone.

+x

 

beliblisk - 11/19/2020 7:25:04 PM

+x

 

Hanaldo - 11/19/2020 12:05:18 AM

No reason why you can't use it, some of those flange shapes are going to make things challenging for you but it's certainly usable. 

You either need to seal the flanges with something before bolting them together, or you will need to envelope bag the entire thing. Envelope bagging I find quite unreliable for infusion due to the propensity for leaks, especially on larger complex moulds like this, so I try to avoid it. for sealing the flanges, the easiest and most reliable way I've found is to use an RTV silicone gasket maker (do NOT use an adhesive caulking silicone, these will bond your flanges together regardless of release agent). The downside is this is a bit difficult to clean up after the infusion, so it becomes a bit of a pain to reuse the moulds. Another way I do it is to run a 'bead' of gelcoat all around the flanges, and then bolt the flanges together before the gelcoat cures. This is significantly easier to clean up, but doesn't seal as reliably as the silicone gasket. Using either method, don't forget to seal up your bolt holes as well.

Regarding the sealing mould parts.

Would you say that gum tape in 2mm recess integrated in the flange works better than gelcoat method?

I used RVT silicon befor but as mentioned its a pain to clean so for next multi part tool i was planning to go gum tape route.

thanks a lot

+x

 

Hanaldo - 11/19/2020 12:05:18 AM

No reason why you can't use it, some of those flange shapes are going to make things challenging for you but it's certainly usable. 

You either need to seal the flanges with something before bolting them together, or you will need to envelope bag the entire thing. Envelope bagging I find quite unreliable for infusion due to the propensity for leaks, especially on larger complex moulds like this, so I try to avoid it. for sealing the flanges, the easiest and most reliable way I've found is to use an RTV silicone gasket maker (do NOT use an adhesive caulking silicone, these will bond your flanges together regardless of release agent). The downside is this is a bit difficult to clean up after the infusion, so it becomes a bit of a pain to reuse the moulds. Another way I do it is to run a 'bead' of gelcoat all around the flanges, and then bolt the flanges together before the gelcoat cures. This is significantly easier to clean up, but doesn't seal as reliably as the silicone gasket. Using either method, don't forget to seal up your bolt holes as well.