[QUOTE=JBreault] *groan* More waiting...sometimes I wish for a
magic finish that you could just dip a guitar into and voila, all shiny
and perfect. Oh, well, one can dream right?[/QUOTE]
How about a 50 gallon drum of Super Glue!!??!!
Louis
| Official Luthiers Forum! http://w-ww.luthiersforum.com/forum/ |
|
| A thought to keep in mind on epoxy http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10102&t=7411 |
Page 1 of 1 |
| Author: | Michael Dale Payne [ Thu Jul 06, 2006 3:33 am ] |
| Post subject: | |
Over the past several months there have been a few post where some have said that they followed the cure time on the label of various brands of epoxy before sanding, but still had gum up issues. A prime example is Zpoxy the label claims a 3hr cure time. This is a bonding and handling cure time not full hardness cure. On Zpoxy, this cure time is is for application of a fiberglass over coating, Zpoxy's intended use. When we use epoxy as a pore filler we need for it to cure as hard as possible so that we can easily sand it back with out gumming up. So keep in mind when reading instructions and cure schedules on labels that they refer to the intended use of the product. and may not reflect the cure time required to effectively sand. |
|
| Author: | JJ Donohue [ Thu Jul 06, 2006 3:50 am ] |
| Post subject: | |
Excellent point, Michael. I recently sanded back Zpoxy that was applied months ago...there was a noticable difference in how it sanded compared to over night cure out. I don't know what the magic time is but I plan to wait at least 2 days before sanding. |
|
| Author: | JBreault [ Thu Jul 06, 2006 4:21 am ] |
| Post subject: | |
*groan* More waiting...sometimes I wish for a magic finish that you could just dip a guitar into and voila, all shiny and perfect. Oh, well, one can dream right? |
|
| Author: | Michael Shaw [ Thu Jul 06, 2006 7:56 am ] |
| Post subject: | |
Good things come to those who wait. |
|
| Author: | MSpencer [ Thu Jul 06, 2006 9:47 am ] |
| Post subject: | |
MichaelP, I had some gumming after an overnight cure time, should we wait the 2 days JJDonohue recommends or longer? ZPoxy I am referring to. Mike White Oak, Texas |
|
| Author: | Michael Dale Payne [ Thu Jul 06, 2006 9:52 am ] |
| Post subject: | |
Then you did not get the mix right or you were in cool climitic conditions. If the mix is close to 50% hardner and 50% epoxy then it should haden to sandable in 12-24 hrs. Now it is also possible that you got a bad batch. It happens with every brand now and then. |
|
| Author: | LuthierSupplier [ Thu Jul 06, 2006 9:54 am ] |
| Post subject: | |
Mike, I've had issues too when the zpoxy did not cure in 24 hours. But it was related to the mixture being correct. I always just pour a quarter size dollop on parchment paper of each of the resin and hardner, then I add just a touch more hardener to make sure it will harden correctly(mix up with a toothpick after this). In other words, I'd rather have too much hardener than not enough. Good luck Mike! Tracy |
|
| Author: | MSpencer [ Thu Jul 06, 2006 10:04 am ] |
| Post subject: | |
Fortunately it was my pore fill coat and I sanded it back down to the wood leaving on the pore fill. Just one little spot. I follow with the 2 coats of very thin ragged on coats to finish leveling and pop the grain as (the MichaelP method) Thanks for the info. Probably just did not get enough hardner. It was not a major problem and everything has worked out, but thanks for the input. I run my shop at around 78 degrees (AC/Heat) and RH is 45% using a dehumidifier. Mike White Oak, Texas |
|
| Author: | Louis Freilicher [ Thu Jul 06, 2006 2:57 pm ] |
| Post subject: | |
[QUOTE=JBreault] *groan* More waiting...sometimes I wish for a magic finish that you could just dip a guitar into and voila, all shiny and perfect. Oh, well, one can dream right?[/QUOTE] How about a 50 gallon drum of Super Glue!!??!! Louis
|
|
| Author: | Mario [ Thu Jul 06, 2006 4:10 pm ] |
| Post subject: | |
groan* More waiting...sometimes I wish for a magic finish MEKP cured polyester.... |
|
| Author: | Alain Desforges [ Fri Jul 07, 2006 3:30 am ] |
| Post subject: | |
Yup, catalized poly is the quickest thing out there... Too bad about the extreme toxicity, flammability and the need for a high tech booth... |
|
| Author: | Mario [ Fri Jul 07, 2006 10:02 am ] |
| Post subject: | |
Sad, so sad..... It can also be brushed(yes, brushed) succesfully. Booth? what booth...? |
|
| Author: | SniderMike [ Fri Jul 07, 2006 1:30 pm ] |
| Post subject: | |
Another thought to keep in mind is that it's not good to breath epoxy fumes. I usually forget, but most packages will warn you. I think it may be a sensitizer too. Wear those respirators! Mike |
|
| Author: | A Peebels [ Fri Jul 07, 2006 2:46 pm ] |
| Post subject: | |
Curing temperature makes a big difference. If you can get the temp up to about 100F curing time will be significantly reduced. Al |
|
| Author: | Alain Desforges [ Fri Jul 07, 2006 3:31 pm ] |
| Post subject: | |
[QUOTE=Mario] Sad, so sad..... It can also be brushed(yes, brushed) succesfully. Booth? what booth...?[/QUOTE] Brushes? We can use stinking brushes? How very interesting... Would the results be as good as sprayed? (Of course I guess it depends largely on the brushee!). I seem to recall you saying that you needed a profesional set-up to use this very nasty stuff. Isn't is supposed to kill you in 10 seconds flat? Just kidding... |
|
| Page 1 of 1 | All times are UTC - 5 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|