Which sealant?

[john williams]

Having thoroughly confused myself with types in sticky stuff in tubes, I need some help!
I have been making a new cabin trunk for my 28ft gaffer. The whole thing is made of sapele but will fit into a horizontally flanged large aperture on a GRP deck. It will bolted in place securely so will not have to be bonded as such. A hardwood quadrant trim will be placed over the joint. Im thinking the joints will be sealed with epoxy prior to fitting.
What I need is good flexible sealant bedding compound that can be applied under the trim,will keep the water out of the joint but not bond it permanently in place, as I'm looking at future maintainability.
All the stuff I've looked at seem to emphasise bonding.
Any help would be much appreciated

john

 

[Vallich]

Having thoroughly confused myself with types in sticky stuff in tubes, I need some help!
I have been making a new cabin trunk for my 28ft gaffer. The whole thing is made of sapele but will fit into a horizontally flanged large aperture on a GRP deck. It will bolted in place securely so will not have to be bonded as such. A hardwood quadrant trim will be placed over the joint. Im thinking the joints will be sealed with epoxy prior to fitting.
What I need is good flexible sealant bedding compound that can be applied under the trim,will keep the water out of the joint but not bond it permanently in place, as I'm looking at future maintainability.
All the stuff I've looked at seem to emphasise bonding.
Any help would be much appreciated

john

Have you considered Butyl Tape? I've never used it in your particular application but I have bought and used the kind that comes away from the backing which is supposed to remain sticky but able to be removed and re-used for many years.

 

[Tranona]

Suggest a Polysulphide such as ArboKol 1000 or Boatlife Boatcaulk.

 

[ghostlymoron]

Sika comes in many versions. The 2 most common on yachts are 291i which is a sealant (although with some adhesive properties) and 292i which is a sealant/adhesive. I rarely want to stick things together on my boat with Sika but often want to keep water out. In your situation, I would use 291i.
I've started using PU40 from toolstation which is much cheaper but is a sealant/adhesive.

 

[l'escargot]

Have a look at Arbomast BR. It is butyl based and adhesive but non setting.

 

[[3889]]

I've started using PU40 from toolstation which is much cheaper but is a sealant/adhesive.

Any experience on how easy it is to remove from gelcoat?

 

[Davegriff]

Over the years I've replaced all the sealant on what was a very 'leaky' boat, with butyl. Grips well like an adhesive, but the seal can be broken (with effort) and then fairly easy to remove from gelcoat etc. No more leaks. Previous owner(s) had tried just about everything it seems; sika, silicone, various tapes, even epoxy; all to no avail.

 

[ghostlymoron]

I removed excess with a rag and turps whilst it was still soft. It was quite easy.

Any experience on how easy it is to remove from gelcoat?

 

[skenn_ie]

Jointing

What I have done, for better of for worse, is to put a strip of foam rubber under the joints, leaving 5mm or so to the outside which I then fill with Sikaflex 290DC. That way, I can easily cut through the Sikaflex if I need to remove anything. Ohh, and I have to say it .... I HATE SILICONE !

 

[[3889]]

I removed excess with a rag and turps whilst it was still soft. It was quite easy.

Thanks, will get some.

 

[vyv_cox]

I removed excess with a rag and turps whilst it was still soft. It was quite easy.

During the PBO rebuild of Hantu Biru they have been using wipes to take off excess sealant, apparently very effective. I don't have a copy in front of me just now but I mean to buy some to try. Sikaflex does seem to be one of the most persistent products to clean up when wet, the stuff gets everywhere.

 

[Poignard]

I've had good results using those wipes that come in tubs from places like Screwfix and B&Q. They aren't that cheap but the risk of knocking over a bottle of white spirit is gone.

 

[nigelmercier]

I've had good results using those wipes that come in tubs from places like Screwfix and B&Q. They aren't that cheap but the risk of knocking over a bottle of white spirit is gone.

I've used these with great success: http://amzn.to/1kD18SY

"Specially formulated to clean hands, tools and surfaces from wet and semi-cured paint, sealant, adhesive, bitumen, expanding foam, oil, grease and even silicone ..."

 

[Amulet]

Risking your ire for giving a complicating rather than the requested simplifying response, I'd suggest looking at this supplier:

https://marineindustrial.co.uk/index.php/adhesives-sealants/marine-industrial.html

They have a wealth of sealants and information about sealants, are helpful by phone, and will happily send small quantities.

 

[john williams]

This stuff looks like what im after- any reasonable price too.
Thanks

 

[Martin_J]

I have always used a Butyl based sealant for windows that need sealing, that are held in place using screws/bolts etc. but that might need to come out in future.

Arbomast BR has been great for this..

BUT has anyone any suggestions as to where a Butyl Tape as mentioned earlier (e.g. Arboseal GZ) can be bought off the shelf in the Portsmouth area... I've tried a few Window/Glazing places in Littlehampton but no luck so far...

 

[john williams]

thanks for all your help on this

 

[alan17]

I have always used a Butyl based sealant for windows that need sealing, that are held in place using screws/bolts etc. but that might need to come out in future.

Arbomast BR has been great for this..

BUT has anyone any suggestions as to where a Butyl Tape as mentioned earlier (e.g. Arboseal GZ) can be bought off the shelf in the Portsmouth area...

I've tried a few Window/Glazing places in Littlehampton but no luck so far...

Amazon

 

[Scillyboy]

During the PBO rebuild of Hantu Biru they have been using wipes to take off excess sealant, apparently very effective. I don't have a copy in front of me just now but I mean to buy some to try. Sikaflex does seem to be one of the most persistent products to clean up when wet, the stuff gets everywhere.

I find that WD40 is very good for cleaning up 'wet' Sikaflex 291....

 

[Davegriff]

BUT has anyone any suggestions as to where a Butyl Tape as mentioned earlier (e.g. Arboseal GZ) can be bought off the shelf in the Portsmouth area... I've tried a few Window/Glazing places in Littlehampton but no luck so far...

Ebay.