Screwfix OB1 sealant / adhesive

[jwilson]

Just used some OB1 as my usual local supplier of CT1 is closed. Seems pretty similar. Maker according to data sheet is Siroflex, Barnsley, Yorkshire. Company part of a larger multinational group.

 

[bluerm166]

Sikaflex 292 has excellent grab and is made for this kind of thing.More pleasant to use overhead than epoxy .Get light props ready for the mid point before applying.

 

[Poignard]

I will go with OB1 as I have screwfix next to me. I want to actually to attach battens across not along, so there will be some pulling force trying to unbond. Not significant, but I am not sure if OB1 can overcome it. Or I could use epoxy?

'

If I was doing it, I would use epoxy.

Not because I don't know that OB1 wouldn't do the job but because I do know that epoxy would.

I would not want to have to do the job again and if I use epoxy, I won't have to.

 

[Ammonite]

'

If I was doing it, I would use epoxy.

Not because I don't know that OB1 wouldn't do the job but because I do know that epoxy would.

I would not want to have to do the job again and if I use epoxy, I won't have to.

I havent used OB1 but if its "similar" to CT1 it will work well. Its incredibly strong and when using it to stick something like plywood the ply will more likely delaminate when trying to prise it off. Just dont use it for anything you might want to remove in a hurry if you cant get a blade in behind it to cut it off! Its brilliant stuff and I will be trying OB1 as Screwfix is round the corner.

 

[Big Soff]

I havent used OB1 but if its "similar" to CT1 it will work well. Its incredibly strong and when using it to stick something like plywood the ply will more likely delaminate when trying to prise it off. Just dont use it for anything you might want to remove in a hurry if you cant get a blade in behind it to cut it off! Its brilliant stuff and I will be trying OB1 as Screwfix is round the corner.

OB1 is the Original formulation that was under the CT1 brand so it is not similar but it is the original CT1 product as CTec have changed their formulation. That is what I was told at Screwfix.

 

[Mistroma]

OB1 is the Original formulation that was under the CT1 brand so it is not similar but it is the original CT1 product as CTec have changed their formulation. That is what I was told at Screwfix.

A few different claims around, one saying that the formulation had been in use for many years and another mention of it being an improved version. A bit of secrecy over the location of the factory but pretty certain CTec don't make it. I still believe that there's some sort of legal agreement in place to reduce direct comparison with CT1.

I personally think that it is an improved formulation. Both products have very similar composition but OB1 has an additional component, probably to speed up setting time or enhance strength of the material, probably both.

 

[Big Soff]

OB1 is exactly the same. I have been assured by my local supplier as well because they have now shown me a written statement that OB1 was previously marketed under the CT1 brand. Also if you look at a CT1 tube you will see that it says new formulation.

So turns out that OB1 is the original formulation which has been around for over 15 years under the CT1 brand but CT1 is actually a completely new product.

Basically OB1 is a new brand but original product inside and CT1 is the same brand but a completely new Product inside.

 

[Mistroma]

OB1 is exactly the same. I have been assured by my local supplier as well because they have now shown me a written statement that OB1 was previously marketed under the CT1 brand. Also if you look at a CT1 tube you will see that it says new formulation.

So turns out that OB1 is the original formulation which has been around for over 15 years under the CT1 brand but CT1 is actually a completely new product.

Basically OB1 is a new brand but original product inside and CT1 is the same brand but a completely new Product inside.

Interesting. The earlier information from a datasheet did point to OB1 being an enhanced product (extra ingredient to promote faster cross-linking). It still makes sense if CT1 is actually a cheaper degraded formulation which isn't as good as the original version. The datasheet information made me think that OB1 might be superior even if CT1 is a completely new product.

It might explain some of the legal threats implied in an earlier post and the secrecy around who makes OB1 and why it seemed similar to CT1. Thanks.

 

[V1701]

I used CT1 for some years but more recently have used OB1. FWIW they both, in my experience, bond, seal and last well...

 

[SaltIre]

Should this be a sticky thread?

 

[Dejay54]

AVOID OB1
I found it to be RUBBISH!
I was fixing a water in-pipe in a toilet cistern that was weeping. I dried and cleaned everything. OB1 took 2 days to dry, and it still weeps! So everything is wet again - but it is supposed to be able to stick underwater; it is like trying to stick butter to the inside of a glass of water! I really have wasted time and money.

 

[Rappey]

supposed to be able to stick underwater

I've tried a few that are meant to be able to do this, but they don't. .

 

[Dejay54]

Yes - this one seriously does not work. I have to remove it now, clean it up and re do the whole job again with Dow. I notice there is no customer services or even home address for OB1 - very suspicious!

 

[sarabande]

Perhaps less time fulminating and more time searching ?

 

[Gary Fox]

This statement that you have made publicly is malicious, slanderous, without foundation and completely untrue. Unless you retract this immediately, we will be taking legal action against you in the High Court Belfast, where you will be affixed with all costs. We advise to give you this your most urgent attention.

Intereresting thanks

 

[Dejay54]

Thank you I will contact them and fulminate over the fact that the product does not work - maybe they have some suggestions.
thank you again.

 

[alan_d]

Practical Boat Owner's Reader to Reader forum content is visible to all. You can just Google something specific and it will be listed if that comment or quote does appear in the forum. However, it would still be like finding a needle in a haystack if it was something rather common. You could limit the Google search to a specific domain but that supposes you are looking for something specific in that domain.

Much easier if you have a specific issue and want to monitor it. e.g. Company does something they'd rather hide or become aware of a rumour, possibly started by a rival. Fairly simple to monitor if you already know what you are looking for.

It does make me think that they were already aware if this issue. More likely answer than a company running regular searches for any adverse references to them.

Some people will remember that a while ago whenever anyone on here used the term jubilee clip as a generic term for a worm-drive hose clamp, someone from Jubilee would post, pointing out that not all hose clamps were the same and emphasising Jubilee's legal protection. It stopped after a while possibly because Jubilee realised it was counter-productive. I have also heard anecdotal accounts of people referring generically to hex keys as allen keys being contacted by the trademark owner (Apex Tool Group).

 

[vyv_cox]

AVOID OB1
I found it to be RUBBISH!
I was fixing a water in-pipe in a toilet cistern that was weeping. I dried and cleaned everything. OB1 took 2 days to dry, and it still weeps! So everything is wet again - but it is supposed to be able to stick underwater; it is like trying to stick butter to the inside of a glass of water! I really have wasted time and money.

Odd, because I use it frequently for almost identical jobs and find it to be superb. A question - was the joint previously made using a silicone sealant? It is well established that silicones inhibit the curing of many paints and adhesives. Maybe that is the problem with your OB1?

 

[dankilb]

Yup better hope it can seal a toilet cistern because it’s sealing our keel joint (and quite a few others’ based on post on here)! It certainly sticks to everything I show it too (inc recently a small area of sodden ply I needed to re-encapsulate in GRP - which it costed and sealed perfectly, so the epoxy could cure over the top). I don’t really envisage having any other non-specialist sealant-adhesive on board from now on - maybe apart from Pu40 for when I need to save a few quid!

 

[JFowler]

It’s the best marine adhesive / sealant I’ve come across. As said sticks to anything including my leg!