sikaflex

[smeaks]

I am in the process of replacing a plywood aft deck fitted into a GRP supporting lip. I want to reduce to a minimum any srew/bolt holes securing the deck. I am therefore looking for a suitable adhesive that will also rliably seal the wood/grp joint. I understand sikaflex may do a suitable product... but what grade? are there more suitable products to use?

Nearly there.......

 

[Salty John]

In my experience the best product for this job is 3M 5200 adhesive sealant. It makes an extremely strong bond and is usable above or below the waterline.

 

[exapp]

Can recommend Tec7 highly enough...

http://www.tec7.com/

 

[alb40]

One of the skiaflex is also an adhesive sealant like the 3M one

I think it was something like sikaflex 292 - it had 'marine adhesive sealant' written on the tube too

 

[alienzdive]

Even attatching ply wood to the fibreglass I would prime the entire board with epoxy prior to attatching, this would give the timber a further protection prior to using an adhesive.

 

[Lakesailor]

Read all about it

 

[ThreeSummers]

[ QUOTE ]
Even attatching ply wood to the fibreglass I would prime the entire board with epoxy prior to attatching, this would give the timber a further protection prior to using an adhesive.

[/ QUOTE ]
If you do that, you may as well use epoxy to join the deck to the hull. IMO it will be much stronger than Sikaflex (or any other glue/sealant). Just make sure the old GRP is well sanded to give a good "tooth" for the new desk to bond to.

Wobb.

 

[eyehavit]

Wobblylegs, this is intended as a direct reply to the original poster and not intended to reply to your post.
To smeaks: On one hand you wish to use screws which by definition form a RIGID joint.
On the other hand, you wish to....."reduce to a minimum" .... the amount of screws and use Sikaflex as a bonding/sealant, which, by defintion is a FLEXIBLE sealant/bonding agent.
You cannot be half pregnant. There is a minimum amount of screws you HAVE to use to secure integrity. Reducing that number is imo a lousy option. Trust Sikaflex for its sealing excellence but be very circumspect about its long term bonding abilities where salt, water, vibration and flexing are all brought together.