sean69
You mention at the bottom of your post #180 about finishing your birds eye maple stock off in "cyanoacrylate" and paste wax for the finally. When I looked it up cyanoacrylate is basically an adhesive and commonly known as Super Glue.
Since I have always been interested in gun stock finishing do you think you could please explain for us folks the method in which the cyanoacrylate is applied and what advantages it gives to a stock finish and any disadvantages if any.
I really enjoy following this thread and thank you for sharing with us all your projects and insight into how things are done.
Trade name "Super Glue" but - yes, exactly that
Before I get into it:
- My understanding was that originally it was developed as a battlefield dressing during Vietnam..... and I have used it for minor cuts in a pinch... though the actual history seems much more interesting!
https://en.wikipedia.org/wiki/Cyanoacrylate
- don't buy it from Canadian tire at $8 for a 15ml throw away tube go to a hobby shop and pay that $8 for a full ounce. & they will have any viscosity you need.
- don't waste time with accelerators.
- I've never found a solvent that will dissolve cured CA, anything that refers to cleanup or solvent is a lie.
- FULL EYE protection and breathing protection. it cures on contact with moisture, the fumes from a large surface area (say a gunstock) will burn your eyes and get chunks of crap gumming them up... and you won't be able to breathe either. i.e goggles.
- GLOVES!! the super thin stuff will wick into everything VIA capillary action. Just opening the bottle can coat your hands. - refer to "no known solvent" above, you have been warned!
- I store mine in a capped mason jar with a large packet of silica gel.
- we are not bonding anything here, but it's useful to keep in mind that CA has great tensile performance, but performs terribly under shearing stresses.
So, I had been using it for different thing building toy airplanes, building up sind screens, instrument faces. Ran into a couple discussions on wood turners using it as a finish & investigated as 'leveling' a finish on something as unusually shaped as a gun stock is very difficult. Shellac is about the nicest to use & best looking but is not durable.
What I like(want) in a stock finish is 3 layers of protection - some kind of polymerizing oil to completely seal up the wood & bring out any color/figure, also an excellent moisture barrier. The clear coat for the surface finish, ideally something that can be tuned from between: "somewhat semi gloss" to "looking in a mirror". Then wax which protects the clear coat, will shed *some* solvents, another moisture barrier, can be tuned to the shine you want AND is easily repaired/replaced/removed. (BTW, wax your barrels and actions too!!, got a CCH action? find a good UV protecting paste wax and have at it

)
The CA glues hit all the points I want in a clear coating PLUS have the added benefit of being tough as nails. The biggest boon is that there is no waiting between applications.
Applying it is the tricky part, on a flat surface it's no problem the thinner ones will 'self level', thicker viscosities will have to be spread around with an old credit card or something similar or on a spinning part (like the pen turners) again no problem you can wipe it on evenly before it has a chance to cure. (If you have gotten to this point and forgotten the goggles and respirator; you have probably already left the room and are on your way to crappy tire for goggles & a respirator)
Applying evenly it to a complex part (like a gun stock) is far more difficult, you certainly can't spray it, wiping it evenly over the entire stock before it cures is probably not possible, I have 'chased' it across a surface with the applicator - which works fine for the first coat, but the second will take longer to cure & I ended up with runs anyway.
Still experimenting with application - I'll probably try a thicker glue. (there may actually be a retarder available?)
Finishing is just sandpaper & elbow grease, it's best to wet sand it as the dust is extremely fine (and you are not worried about moisture penetrating your stock since you have at least 2 applications of cured oil in it

) CA is surprising tough and it will take a little while to sand down a run or drip. Resist the urge to power sand anything.
Basically I use a sanding block with a very fine (320.400g) sandpaper to find all the high spots &/or dips then work them down with 220g or fill any dips if necessary. then I'll go to a wet paper to start evening the finish. That can be worked up as far as you like 600g - 1000g with paper then you can switch to auto body compounds & pads to over 2000g. You could also go with pumice &/or rottenstone after 1000g if you are that kind of guy
Then wax to taste
As far as durability ~ it is an engineered product, so different vendors product may have different properties. I've never seen the hobby shop stuff (Bob Smith Industries) yellow, break down or crack after time but then again I've not been using on wood for long. The wood turners use something called "hott stuff" which is also commonly available in hobby shops (and lee valley) - but I have no experience with that one. Looking at another one called TMI - specifically marketed to woodworkers.... no info on that.
I think I will actually post on a wood forum to see what other people think of the different product lines ... *
I have a couple of test pieces floating around the shop, I liked very much the results - I have a little walnut box side project on the bench right now that I will probably "test" again...
* the greatest place to ask about finishing anything is on a woodworker forum, (Canadian Woodworking/Fine woodworking etc) finishing something is an art in itself and I'm finding usually the most time consuming! whatever you need to know, someone on there has been doing it for 50 years. I learned entirely way too much about oil applications after a 10 post dressing down than I ever wanted to know. I met a guy who deals in abrasives on CWW - now I have some sandpaper that never seems to load up or get dull!! And don't forget the Luthiers, without them I would never have discovered Aniline dyes or how to correctly use tru oil.
They all also seem to use auto body stuff for polishing (well not the French polishers, but lets face it life is too short for a French polish!!)
Wax, I had been using Clapham's but recently switched to Mothers auto body. (both smell real nice) Mother's dries up much harder & seems like a more durable choice. (Carnauba vs. beeswax I guess)
Drawbacks, so far I see none, even if you had to do a spot refinish, it should be very easy to blend it. Completely removing it evenly for a total refinish would be problematic.... but otherwise no, nothing
