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Thread: ONE FOR THE THINKERS
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24th July 2014, 09:37 PM #1
ONE FOR THE THINKERS
I had to make 7 Tasmanian Myrtle pens. They were all the same pen kits so I turned the lot the same. Then I started to apply CA to them. Most went well. However on 4 blanks (i.e., 2 pens - slimlines), after I applied 15 coats of CA I watched the entire shiny CA evaporate and the blanks went dull. I sprayed with accelerator and applied another 5 coats. One evaporated again to a dull finish. Then I sanded the lot, including these blanks with MM. Guess what - the polish look came out of nowhere.
Anopther 2 blanks went frosty with the accelerator and stayed that way even after another 6 - 8 coats of CA. I couldn't give a bugger by this stage and just MMed them back. The frosting went and a high polish resulted. I know that MM can cut back through the frosty layers but I almost had to go back to timber before the bright shine.
This is the first time I have ever seen any of these things happen and it was only on Ts Myrtle, because I used the same glue and accelerator on 4 other timbers later and no problem.
As Paulene said: Please Explain
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25th July 2014, 01:44 PM #2
I have always over the years find questions like this to be very hard to answer because of so many factors. I am sure others will come on here and give you examples of what has happened to them and possibilities of what to look for. To me the very first things I would need to say is why in the world 15 coats of CA???? If they are thin coats switch to med and if they are med you are wasting time and money. That pen will not look any different if it had 4 coats or 15. As far as the fogging goes it could be moisture. I never like to use acclerator because it hardens the ca too fast. I like the coats to naturally dry. There could be moisture in the wood. Not sure what the answer is and I am sure you will get some other guesses. Good luck and hope you find an answer.
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25th July 2014, 03:10 PM #3
Greg ! the myrtle may be a bit oily ,do you wipe with "metho" or the likes before applying the first coats of CA, There should be no need of accelerator for thin CA ,you only get seconds to smooth it before it will go off , But like JT says lots of variables ( did you forget the sugar in the coffee ) cheers ~ John
G'day all !Enjoy your stay !!!
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25th July 2014, 08:47 PM #4
I don't use medium CA because I have too many problems with ripples forming. That may just be me but I don't have the problem with the thin CA. I have been using 50cps and accelerator every 6 coats (all purchased from K&R International - Ezi-Bond) and have never had the problem before. I always run Metho over any timber blank before I apply CA - mainly to pop the grain. All I can guess is oil in the timber as John suggested, but it amazed me that the CA shine would completely disappear yet come back with MM sanding.
As an aside, the last lot of CA I got was mistakenly sent as 5cps. I tried it today for the first time. That stuff dries so quickly that the paper towel was smoking and gluing to my fingers before I could throw the towel away. It took a bit of getting used to.
I apply 20 coats so that I get a good build up of CA on the timber. The more coats, the greater the depth and plenty remaining after MM sanding.
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