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Black Ribbons from Kids' Skis

post #1 of 10
Thread Starter 

I'm hoping for a little wisdom to explain what I'm seeing when I scrape my kids' skis.  Note that I don't see this when I scrape the grown-ups' skis.

 

 

 

 

I'm using a sharp 6mm plexiglass scraper.  The skis were waxed with Toko S3 Red hydrocarbon wax.  They sat for at least 10 hours before scraping.

 

The black part of the ribbons doesn't seem to me to be just dirty wax.  Unlike the normal scrapings, which are dull and delicate, the black scrapings are shiny and have some tensile strength.

 

So, is it possible that I'm scraping P-Tex off?  Or, could the act of waxing be bringing something out of the base that combines with the wax?  My gut feeling is that this is more than just dirty wax.  I keep my iron set to 120 degrees Celsius and the wax does not smoke.  I don't think base material melts this low.  The kids' skis are Blizzard Viva Jr. and Atomic Sweet Stuff.

 

I'd be grateful if anyone can tell me what's going on, if it's a problem, and what the best practice is regarding it.  Thanks in advance.

post #2 of 10
Quote:
Originally Posted by Xela View Post

 

So, is it possible that I'm scraping P-Tex off?

 

Yes.   That's exactly what is happening.   I think i'd use the word 'peeling' here.

 

Quote:

Originally Posted by Xela View Post

 My gut feeling is that this is more than just dirty wax.

 

Yep.    Have you checked base flatness with a true bar yet?

 

 

Quote:
Originally Posted by Xela View Post
  I don't think base material melts this low.

 

You didn't actually melt it.


Edited by cantunamunch - 3/8/13 at 12:30am
post #3 of 10
Thread Starter 

Thanks for the advice.  It's good to get some confirmation.

 

Perhaps the word should be "shaving" or "planing".  Anyway, it might explain how the skis got a bit railed during the early season.

 

Just last month I did a round of base flattening, using a straight-edge and the SkiVisions Base Flattener.  I got them to the point where the outer inch was flat, but some of the middle was still dished.

 

When I scrape, I often bend the scraper a little bit in order to help get the wax from uneven parts of the base.  I guess this concentrates a lot of pressure on a small piece of base.  I feel that if I don't do this, I don't remove enough wax.

 

I'm wondering about solutions.  Perhaps a dull scraper is what I need.

 

Are the kids' bases different than adults'?  Softer P-Tex?  Not sintered?

post #4 of 10

Are you sure you didn't use a light sabre to scrape those???

 

jk.gif

post #5 of 10
Thread Starter 

No light saber, but I do tend to like my tools sharp.

 

Now my friend who's into metalworking...  He uses a plasma cutter.  I love the sound of that.

post #6 of 10
Quote:
Originally Posted by Xela View Post

 

 

When I scrape, I often bend the scraper a little bit in order to help get the wax from uneven parts of the base.  I guess this concentrates a lot of pressure on a small piece of base.  I feel that if I don't do this, I don't remove enough wax.

 

Bending the scraper makes the problem worse, because the bend will keep digging in the already present pit.

 

Stop doing that.     I see three choices:  1) leave the wax  2)   Put a piece of white (nonabrasive)  Fibertex pad on a sanding block, use that to remove surface wax 3) get those bases back to flat. 


Quote:
Originally Posted by Xela View Post

 

 

Are the kids' bases different than adults'?  Softer P-Tex?  Not sintered?

 
 

Not significantly.    Bases are usually in the 65D-68D range.   Plexi scrapers will be 85D-90D.     Put in other words, if the skis are railed and the plexi is bent to scrape the hollow, it will win against the toughest adult bases. 


 
post #7 of 10
Thread Starter 

cantunamunch, thanks for the insights.  It looks like I've got some experimentation ahead of me.

post #8 of 10

Try removing the excess using the fiberline under the iron technique instead.

Light scrape, then go with just brushing to remove the remainder. 

 

You can also pick up a beefier scraper that will not bend as much.  

Then for the weird parts of the ski, poke at it with a soft scraper, like an old creditcard/hotel cardkey

 

Anyhoo, some things to try out

post #9 of 10

One thing i thought of overnight, after thinking how you got those ribbons.

Which technique are you using for scraping?


1) Are you using the Planing/chiseling technique   ---> __\___  --->

2) Or the butter-on-toast technique   --->  __/___ --->

 

 

If you are using technique (1) this could be the reason why you are getting ptex.   If you get pedantic about it, (2) should be the proper scraping direction to use, where you will also be pressing some of the wax into the ski.

post #10 of 10
Thread Starter 

raytseng, good thought.  I use both 1 and 2, but the ribbons come from 1.  I find it's more efficient at wax removal.  Apparently, it's rather efficient at base removal, too.  I think I'll be using 2 exclusively from now on.

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