A 'how to' for High Gloss Finishing - Page 45 - diyAudio
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Old 10th November 2013, 02:42 PM   #441
tvrgeek is offline tvrgeek  United States
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Cascamite is not available locally. You must be hording the good stuff away from us colonists. It may be the same as Wellwood "plastic resin glue" I'll look into it.

We have this stuff "Goralla glue" which may be similar. I did not use it because step one is to moisten the seam. I am working on the theory SOMETHING is shrinking. Glue or the fibers.
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Old 10th November 2013, 02:46 PM   #442
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Quote:
Originally Posted by Jay1234 View Post
Hi,

how would you go about getting A nice smooth shiny finish on a beer can i.e. removal of logos & paint. That had been filed with resin, so it was solid.
Would paint stripers work? but leave a nice finish.

Jay
Stripper gets the paint off as you have very little material to sand.
Aluminum will flash oxidize, so you need special self-etching primers as the base coat. Then filler primers, sealer, color and clear. (wet sanding from 600 to 1200 or finer)

With the correct primer, it is relatively easy as you have a stable substrate. Our question here is when we do not.
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Old 10th November 2013, 02:50 PM   #443
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DAP Products - Construction Adhesives - DAP® Weldwood® Marine Resorcinol Glue maybe.
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Old 10th November 2013, 03:11 PM   #444
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Adding block made with Gorilla glue, including dampening the surface, and super glue gell. The gell would be very expensive to do a full set of.
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Old 10th November 2013, 06:35 PM   #445
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Here is a picture showing the level of penetration of the 50/50 varnish and thinner into 3/4 inch mdf. How much of this was carrying solids I can't say.
The seam is super glue. Looking closely I see voids. When glued up, it had squeeze-out. One point against superglue.
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Old 10th November 2013, 08:54 PM   #446
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The Gorilla original glue is polyurethane based and the foaming action can create a weak joint in wood. The new Gorilla wood glue is PVA based, and while a the top end of PVA glues it is still PVA based...

The resorcinol is kind of the next thing up from urea formaldehyde, I've never used it but I believe it is solid in a similar way.
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Old 10th November 2013, 10:02 PM   #447
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unibond 800. Dries hard..no creep.
This type of glue does not have the initial tack that yellow glue has so you need clamps/mechanical fasteners/vacuum bag to hold stuff until the glue sets. I use a heating blanket to speed setting.
When I glue up with this stuff I put a bit of the mixed glue into a ziplock bag when the glue in the ziplock is rubbery I know the glue has set enough to hold.

Vacuum Pressing Systems -- Veneer Glue

As an added plus the owner of the company is a great guy...

Evan
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Old 11th November 2013, 11:30 AM   #448
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Unibond. Found it. Thanks. I still wonder what is used in production shops. I would guess a therma-bond of some kind for speed. some sort of modern version of hide?

Yes, the foaming gorilla glue may not be quite as strong as some others, but if you do test samples, you will see it is stronger than the wood providing you do it correctly. All 7 of my test samples are more than strong enough.

After baking the sanding sealer set at 170 for an hour, I was able to sand them with 220 by hand. Really strange, the seam was far more pronounced as if the tempered edge of the MDF expanded lengthwise. This did not happen on any of the varnish sealed ones. I sanded them smooth again which exposed raw fiber again.

After 4 coats of varnish, it is not building on the surface so it can start to fill and smooth. I went to varnish over top of the sanding sealer. Some soaked in still.

Having the deep penetration will greatly change stiffness, resonance and damping of the MDF. In some ways, it may be going in the wrong direction. In other ways, three layers of different stiffness is good for not transmitting vibration.
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Old 11th November 2013, 11:38 AM   #449
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"Unibond 800 is a two-part, urea formaldehyde, liquid resin glue. Because of its relatively long open time (45 minutes @ 70°F), rigid glue line, and gap filling properties (up to 0.02"), it is ideal for veneering, bent wood laminations or any vacuum pressing application. Unibond won't cold creep like some PVA glues, so complex veneer projects and curved work are safe. Since it is water resistant, it makes a first-rate plastic laminate glue in kitchens and bathrooms. After mixing, apply with a short-nap roller or brush. Comes with hardener. Not for use under 70°F."

From Highland Hardware. ( good woodworkers supply) this has several telling comments.
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Old 11th November 2013, 11:42 AM   #450
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Ultra-Cat Pre-Catalyzed Powder Veneer Glue 5lb

Maybe similar to Cascamite?
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