What's wrong with my brush? - Router Forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 10-15-2007, 01:17 AM Thread Starter
 
Join Date: Sep 2007
Posts: 36
 
Default What's wrong with my brush?

Purdy is a good name brand. Yet my Purdy nylon/polyester brush is having a "bad hair day" that is getting worse the more I use the brush.

The hairs are curling back from the body of the brush, as opposed to lying straight. It's starting to look like a pom-pom. When I clipped the bad ones so I could continue work, more started curling back to take their place.

I'm using the brush with shellac, and it was new for this job. I never soak it in solvent. To clean, I wipe off what I can, apply a few ml of clean alcohol to the brush, work it in with my fingers, and wipe it out again with a paper towel. Repeat that once or twice more. Then comb with a brush comb and mold it to a chisel shape to dry.

--John
JDługosz is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 10-15-2007, 02:28 AM
Honored Member
 
harrysin's Avatar
 
Join Date: Jan 2007
Country: Australia
First Name: Harry
Posts: 14,634
     
Send a message via Skype™ to harrysin
Default

I can't offer advice on you're brush problem but what's with the Pom Poms John?
Harry, ex Pom, now an Aussie. (only kidding)

Harry



Nothing but heaven itself is better than a friend who is really a friend. - Plautus






harrysin is offline  
post #3 of 13 (permalink) Old 10-15-2007, 07:26 AM
Registered User
 
Join Date: Oct 2004
Country: United States
First Name: Richard
Posts: 387
 
Default

Hi John: Have you tried a pure bristle brush? It sounds like the shellac is attacking the brush. Woodnut65
Woodnut65 is offline  
Sponsored Links
Advertisement
 
post #4 of 13 (permalink) Old 10-15-2007, 10:40 AM
Registered User
 
Join Date: Sep 2004
Country: United States
First Name: jerry
Posts: 558
 
Default

I have heard good things about Purdy brushes also. It sounds like Woodnut is correct something is reacting with the brush. If you can purchase an inexpensive bristle brush and after using leave it suspended in your shellac. If it is used only for shellac it isn't necessary to clean it. I have a 2" badger hair brush that has been in some sort of shellac for over 5 years - still going strong. You can also pad on the shellac.

Regards
Jerry
jerrymayfield is offline  
post #5 of 13 (permalink) Old 10-17-2007, 07:16 PM Thread Starter
 
Join Date: Sep 2007
Posts: 36
 
Default

I got a white china bristle brush (also Purdy) to replace it. The question is, why would shellac attack nylon? I've always heard that nylon is good to use.

I'm not padding the shellac because I don't want to "scrub" the first coat at all, and disturb the dye.
JDługosz is offline  
post #6 of 13 (permalink) Old 10-18-2007, 10:11 AM
Registered User
 
Join Date: Sep 2004
Country: United States
First Name: jerry
Posts: 558
 
Default

I don't know what is causing the problem with the brush,but it sounds like a reaction. What dye are you speaking of ? the natural dye in one of the lesser refined shellacs or are you using the shellac as a toner.

Regards

Jerry
jerrymayfield is offline  
post #7 of 13 (permalink) Old 10-18-2007, 01:07 PM Thread Starter
 
Join Date: Sep 2007
Posts: 36
 
Default

I dyed the wood first. The first coat of shellac needs to act as a sealer. The alcohol will re-mobilize the dye, so rubbing it will move the dye around. In fact, rubbing with a wet rag is how I removed too-dark areas (drips and lap marks) after the dye dried.
JDługosz is offline  
post #8 of 13 (permalink) Old 10-19-2007, 11:14 AM
Registered User
 
Join Date: Sep 2004
Country: United States
First Name: jerry
Posts: 558
 
Default

Quote:
Originally Posted by JDługosz
I dyed the wood first. The first coat of shellac needs to act as a sealer. The alcohol will re-mobilize the dye, so rubbing it will move the dye around. In fact, rubbing with a wet rag is how I removed too-dark areas (drips and lap marks) after the dye dried.
This is the first I have heard that the wood was dyed. What is the solvent for the dye ? If its Transtint or any alcohol dye you have pinpointd our problem. Start from the beginning and list the exact steps used to get this far, we maybe able to help.

Regards

Jerry
jerrymayfield is offline  
post #9 of 13 (permalink) Old 10-19-2007, 11:55 AM Thread Starter
 
Join Date: Sep 2007
Posts: 36
 
Default

We discussed this earlier <A HREF="http://www.routerforums.com/55402-post4.html">here</A>. To be more specific, the dye was half Transtint (with 30 parts water) and half Mohawk powder (initially dissolved in denatured alcohol and then diluted with water). So the resulting dye was about 10% alcohol.

All the dye solvent had evaporated long before I started shellacking. Only the first coat had opportunity for the brush to contact the dye, and the problems with the brush worsened with repeated use.

Before that, I had raised the grain using water. Again, it all evaporated before continuing. Then I sanded with 220 on a random orbital sander.

This is high-quality cherry plywood.


—John
JDługosz is offline  
post #10 of 13 (permalink) Old 10-21-2007, 11:23 AM
Registered User
 
Join Date: Sep 2004
Country: United States
First Name: jerry
Posts: 558
 
Default

Dye will always react with whatever was used as a solvent and shellac isn't like varnish,where when the thinner evaporates it will no longer react with the varnish.Shellac is an evaporative finish-when the alcohol is gone it is dry. Apply more shellac and it melts into the existing finish and becomes part of it. Varnish is a reactive finish after the carrier -mineral spirits-evaporates it reacts with oxygen and cures(3-4weeks to fully cure). You will have much better results(at least I do ) using water soluble dye and using shellac as a seal or barrier coat.

Regards

Jerry
jerrymayfield is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Router Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
What am I doing wrong? Lokheed General Routing 13 08-17-2007 09:32 PM
Making a template, where did I go wrong? Thom2 Guide Bushings and Templates 10 08-09-2007 08:54 AM
What's Wrong Here? cabinetman Lobby 4 06-09-2007 07:36 AM
what did I do wrong? vapochilled Table-mounted Routing 10 06-05-2007 10:06 AM
Things wrong with site 46_trap Lobby 14 07-25-2005 01:36 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome