I have heard reference?to resorcinol in my circles mostly about the "old days" before epoxy and plastic resins became easier to work with coupled with fears of the dangers of formaldehyde. But they weren't building critical marine components or operating on government contracts either. Younger guys than me will probably never even hear of it as they are so inundated with epoxy EpOxY? !!!!EPOXY!!! marketing and social media nowadays! Being able to use a just-add-water powder like the plastic resins sure makes it easy to prep a batch to use and clean up too.
On Wed, Mar 17, 2021 at 11:50 AM Mark Koury <
mhkoury@...> wrote:
Does anyone use?resorcinol glue? For years this was the only Gov. approved glue for outdoor structural wood members. This has good shelf life - 2 part, powder and hardener. It has a long open time, unless you are working on a very hot day. (Open time is temp dependent, will not set up on a very cold day) The result is waterproof and not degraded by UV light like epoxy. It dries rigid with minimal creep. Brand is DAP. Ideal glue for exterior laminations. Glue line is darkish red.
Mark
Jonathan,
IIRC, thickened epoxy in general is weaker and used when a filler is needed due to imperfections in mating materials. Planned wood mates perfectly and just rolling the mixed epoxy is also quicker.
Imran
?Glen,
West System makes a lot of different stuff but if you are thinking about basic 105 epoxy then gluing up laminations is a common application.? The advantage is that it doesn't need clamping pressure like pva glue and is completely weather proof.? The downside is it takes longer to set but is kind of controllable with different hardners and shop temp.? Plan on 24 hours.? Word to the wise, let a piece fully cure before unclamping laminations in tension.? Otherwise, you will hear little popping sounds which are not good. Don't ask me how I know.
Depending on the surface roughness of the mating pieces you may want to use a thickener like fumed silica.? Surfaces are wetted out with un-thickened epoxy then go back and slather with the thickened.? You can play with consistency like pancake batter to peanut butter.? "They" say thickener will not affect the bonding. Thickened is a much easier material to wok with than the liquid form.? You probably know by now most tools become sacrificial although acetone can remove some uncured sticky stuff. Of course read the lit and talk to the dealers.? There are a ton of youtube videos out there.? Cedar strip canoes and kayaks have several smaller formed laminated parts like stems and seats.
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Brett Wissel
Saint Louis Restoration
1831 S Kingshighway Blvd (at Shaw Blvd)
St Louis, MO 63110
314.772.2167
brett@...
