Author Topic: Vac Sys marks on wood?  (Read 1202 times)

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Offline LDBecker

  • Posts: 29
Vac Sys marks on wood?
« on: April 11, 2017, 01:27 AM »
So... I was using the Vac Sys to hold a piece of cherry-veneered MDF to sand it prior to staining and laquering... very handy... but I noticed round marks on the wood that showed up when I stained it. Have others experienced that?

Is it the Vac Sys pulling out more saw dust in that spot? I DID thoroughly wipe down the wood before finishing, and had the CT36 on when sanding with the ETS 125/3.  Or is it just the rubber leaving marks on the wood? I have only used that particular vac head a few times, but had not stained anything I had held on it yet.

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Offline Birdhunter

  • Posts: 1743
  • Woodworker, Sportsman, Retired
Re: Vac Sys marks on wood?
« Reply #1 on: April 11, 2017, 05:56 AM »
The vacuum heads are rubber and may contain some amount of oil. I've never seen this happen using my Vac Sys, but I don't stain much.

A test would be to wipe the rubber head with a clean white cloth and see if any residue appears.

The other possibility is some degree of abrasion between the wood and the rubber head.
Birdhunter

Offline grbmds

  • Posts: 1622
Re: Vac Sys marks on wood?
« Reply #2 on: April 11, 2017, 06:35 AM »
I have not had this happen. I clean the rubber on the heads with Armor-All and still don't notice any marks on wood clamped on the Vac Sys.
Randy

Offline kcufstoidi

  • Posts: 704
Re: Vac Sys marks on wood?
« Reply #3 on: April 11, 2017, 07:06 AM »
Randy just a heads up, Armor All contains silicones. Silicones, which every good finisher knows are a big no in any wood working shop as they cause major finishing defects. Because of the extremely small molecule they are extremely hard to get rid of on a piece of wood.

John

Offline grbmds

  • Posts: 1622
Re: Vac Sys marks on wood?
« Reply #4 on: April 11, 2017, 10:05 AM »
Randy just a heads up, Armor All contains silicones. Silicones, which every good finisher knows are a big no in any wood working shop as they cause major finishing defects. Because of the extremely small molecule they are extremely hard to get rid of on a piece of wood.

John
@kcufstoidi  Yes, I know that and tested it first before I commonly used it. No problems that I was able to notice. I am always very careful to do a fine wipe with a dry cloth and I don't do it very often; only when there is a lot of dust build up. The recommendation came from Brian at a Festool class in Indianapolis and he's apparently done it since the Vac Sys came out. He felt that it keeps the rubber flexible which is obviously a requirement for maximum suction. Anyway, I appreciate the comment. It just hasn't been a problem for me.
Randy

Offline LDBecker

  • Posts: 29
Re: Vac Sys marks on wood?
« Reply #5 on: April 20, 2017, 12:51 PM »
Thanks all for the suggestions- I was reluctant to use any cleaning fluids on the rubber for fear of degrading the rubber- but I don't think it's leaving anything on the wood. I wonder if I just need to more thoroughly wipe down the wood before I stain it - i don't often stain things either, but was trying (came fairly close) to match the stain of the piece the shelf I was making went into. It looks like odd grain, unless you're aware of it. I'm chalking it up to new rubber pads and not wiping the workpiece down enough before staining...