Wood Glue

How about this?

EvoStik Polyurethane Wood Adhesive 310ml

Screwfix Product Code: 40778

Class D4.

IME it does not foam as much as other PU adhesives

Seems to be very similar to description for 'Lumberjack' i.e., 5min D4 Polyurethane

Interseting in all tests I can find Polyurethane comes off the worst for strength .. e.g.

I don't really have anywhere that I have used this and been able to compare directly with other glues, but as a gut feel it seems significantly stronger than brown PU I have used. Trouble is, the woodwork has been rather crude so no two joints have been similar enough for a real comparison.

I know that such reviews are to be taken with huge quantities of salt, but many of the Screwfix reviews are quite positive.

If you want gap filling and strength, then you would probably need an epoxy like West Systems. As you say poly will fill gaps but not with any great strength.

Unwise to rely on glue for any external/damp places joints in any critical application. Timber expansion/contraction soon causes failure.

Boat builders might disagree.

l+310ml/p78519

Resorcinol as used by boat builders.

I use Cascamite for out door applications. Find it excellent

Not likely to be much movement outdoors I wouldn't have thought. Moisture content in exterior joinery typically fluctuates between 15% and 17%

So would manufacturers of marine plywood & Glulam beams

However in this case this is to glue up Ridge Scarf joints which are also dowelled ... and bolted to 4x4 posts ... so not relying on glue alone

Cascamite, Polymite, Extramite etc. are only D3 rated and have to be protected from getting wet (paint etc)

Aerolite 306 is exceptional - but too expensive for just this job, as is Polyproof which is another superb 2 part glue

Not since last millennium. It's all epoxy now, although I admit to using a bit of PU on a small repair.

Andy

Boat builders now use GRP exactly because plywood was no good. The only wooden boats that lasted (for a while) were traditional boats, traditionally built.

You see any glue in the Victory? How many Mirror dinghies are left?

And, how many Mosquito aircraft are left?

If you don't keep an outdoor flush door well painted, how long will it last?

Resorcinol as used by boat builders.

I use Cascamite for out door applications. Find it excellent.

Oh which ones?

I know you don't park wooden aircraft outdoors. Not if you want them to last.

I don't know where you are getting this from but I first used Cascamite to build a sailing dinghy 50 years ago. The boats was kept for 10 years. None of the glue joints failed.

Last year I built a wooden table for the patio and used Cascamite. I'll report back in 10 yeasr time.

My father did a lot of small boats and canoes in his spare time and he used Cascamite a lot. Never had any problems.

In message , Bob Eager writes

I once used Cascamite 1 shot (53 years ago!) to glue a rather nice dovetail jointed Oak cabinet I made for a girlfriend's birthday present.

Lovely purple discolouration which had to be planed off:-(

On 11/09/2013 08:25, fred wrote:> On Tuesday, September 10, 2013

They are sold by manufacturer as D3 rated only ... that is where I am getting it from. Look at OP ...

D3 = Interior areas, with frequent short-term exposure to running or condensed water and/or heavy exposure to high humidity. Exterior areas not exposed to weather.

Which mean it is NOT suitable for immersion or constant water exposure unless protected by another finish (i.e paint)

Assume your dinghy had varnish or paint finish ? ....

If it could meet D4 Durability requirement then it would be sold as D4 ... it isn't.

I'm happy for him, but it is not the right glue for the job ... should be D4 rated.

Presumably successful as they had a finish over the glue, but they are not D4 rated.

Almost all wood boat building is now done with Epoxy which is fully D4 rated, and as gap filling as you want it to be.

I built several Beehives using Cascamite - all lasted fine, because white gloss paint kept water off the glue.