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Instructions I've read for routering and fitting kitchen worktops often say something like "If you want to make the joint invisible apply some worktop coloured adhesive to the joint edges". Now, what is this stuff? And where can you get it? Any brand names?

How much to apply -- is about a teaspoonful a foot about right?

If you buy a flat pack kitchen, the coloured adhesive should be supplied with the kit!!........One supplier that springs to mind is "UNIKA"

It's not something that I have done yet, but screwfix sell it-

http://www.screwfix.com/app/sfd/cat/pro ... 9&ts=28646

The screwfix stuff seems to be made by everbuild, who make lots of building chemicals. I have not tried the worktop jointing kits but I have used many of their other products, which are all very good!

Trend even do a range. For black and dark grey worktops, though, I find a good runny black silicone (like Evostik Trade) does just as well.

Scrit

the stuff to use is called colour fill

you can buy it from B&Q, magnet or howdens it comes in a little tube and costs about £6

Old thread i know but i have a butt and scribe work top to join together is it best to use some PVA glue or other adhesive to stick the two tops together and then use the colour match to fill in any holes or will the colour match be enough to stick the tops on it's own

unless im missing something (it wouldnt be the first time)

use the colorfil, get the tops level then tighten up the bolts

i apply a bead of clear silicone to the bottom edge to hold it

hehehe this is a nice old one to drag back ...

Trade names for color matching the biggest range is Unika i use it every day...

unless im missing something (it wouldnt be the first time)

use the colorfil, get the tops level then tighten up the bolts

Colorfill dries way too quick to allow working time and perfect flush joints but even so many kitchen fitters do as you have posted, but from experience the easiest way is:-
once you have routed the joint,bolt holes and biscuit line, use waterproof pva glue for the joint, insert biscuits, bolt the boards together just enough to still allow you to hit them with a rubber mallet (NOT HARD) so you can get a very flush join, then do bolts up tight enough but not excessive. use the color fill in the join.. clean of with a cloth and small amount of acetone.
If you get black marks in the joint its the glue, use a thin blade to hook it out, then re apply a little color fill. clean again.

if need be i might be able to name the Unika colorfill color needed for a particular worktop color if a pic is posted

A word of warning for anyone using biscuits in their worktop scribe and butt joints.
Be carefull not to cut biscuit slots too near the top of worktop especially if you are looking to double them up.
The reason for this is biscuits are made from compressed beech and correct method of use is to glue in with pva woodglue.
Now as we all no pva woodglue is waterbased and on contact with the compressed beech biscuit it will swell.
Need i say more??

I usally find 3 or 4 biscuits slightly below the centre line of worktop is sufficient to help keep things in line and to help reinforce joint.
dont forget the worktop bolts though...

telegraphing biscuits is an overhyped mantra

if you HAVE to put them very close to brittle surface or a thin veneerd board use mitre fix

however mitre fix does have its own problems and you dont do it on large glue ups or on worktops

i just don't get why you need to use biscuits on worktop joints, surely the bolts will hold it far better than the biscuits ever will?

I never use them. They are supposed to prevent the joint lifting on one side but a properly glued and clamped scribe aint moving. Many inexperienced people have cut biscuits only to find that they are now preventing the correct alignment as the slots are slightly out and have to be removed.

that's what i thought, total waste of time

Generally i would agree.
I would have to say that 90% of the time for a standard 600mm butt and scribe worktop joint i would not use them.
However they do have their uses.
I can remember one instance where i was doing a kitchen installation for a customer and they supplied the worktops.
God only knows where and how the worktops had been stored until i started as they were a terrible shape for lining up with each other once the joints had been cut.
This in my opinion is the one time when you are most likely to ever need to use biscuits in a worktop joint.
It certainly helped me to align the two worktops making life easier when tightening the worktop bolts and aiding the alignment process.