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Building Tips and technical articles. => Building techniques => Topic started by: Ward Van Duzer on January 15, 2007, 10:13:08 AM

Title: Laser Burn and CA?
Post by: Ward Van Duzer on January 15, 2007, 10:13:08 AM

OK, I know this has been covered before, but not being a kit builder I guess I didn't pay much attention. I just started a quickee laser cut kit for a special event and guess what? My CA doesn't stick! I don't use the CA for glue per se, but rather as pins to hold things down while the Pica white glue dries. Seems I remember seeing something somewhere about sanding off the burnt stuff. But that didn't seem to work too well either. Am I missing something?  HB~>

Title: Re: Laser Burn and CA?
Post by: Leester on January 15, 2007, 11:29:49 AM

How old is the glue ? They say refridgeration prolongs it's life.

Title: Re: Laser Burn and CA?
Post by: Dennis Moritz on January 15, 2007, 08:43:32 PM

Accelerator. 

Title: Re: Laser Burn and CA?
Post by: peabody on January 16, 2007, 05:45:26 AM

Ward....I believe that a light hit with some sandpaper would heal things....

I had the same results once...and the response shouldn't be to "use more" or to add accelerator...

Title: Re: Laser Burn and CA?
Post by: Bill Little on January 16, 2007, 07:05:21 AM

HI Ward,

Very interesting!  I have not run into the problem................

Let us know what you find out!

Bill <><

Title: Re: Laser Burn and CA?
Post by: Ward Van Duzer on January 16, 2007, 12:08:12 PM

Problem solved! I think...

It appears the Leester was right. The glue died. It was Sig thin. It was on my bench (used, but closed up) for about a year or so. (I don't build with it, just use it to pin things down.) I tried it on fresh clean balsa and no cure. The only way I could get it to kick was to soak one piece of wood with kicker and lay a bead between each piece. I've had thin go bad before, but it usually manifested itself by getting too thick to flow.

Oh well.... HB~>

Title: Re: Laser Burn and CA?
Post by: Bob Reeves on January 17, 2007, 09:04:39 AM

Looks like you have already discovered the problem. First time I ran into that I was a bit shocked as like you the CA always thickened up when it went bad. This stuff looked fine but wouldn't kick, almost drove me crazy till I tried a new bottle.

I have built a bunch with laser cut wood and CA, never had a problem, in fact I read someplace to not sand off the burnt areas. Guess you just have to do what you feel is right for you.