Getting a mirror finish in polyurethane - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Body - Exterior
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 06-29-2014, 03:40 PM
chief36chevy's Avatar
Registered User
 

Last journal entry: Done (or is it?) cont.
Last photo:
Join Date: Sep 2010
Location: Annville, PA
Age: 63
Posts: 122
Wiki Edits: 0

Thanks: 29
Thanked 2 Times in 2 Posts
Getting a mirror finish in polyurethane

Ok so Iím finishing the wood boards in my pickup bed.
I am using Minwax Helmsman Spar Urethane.
My problem is I keep getting brush lines in the finish. I am using a paint brush that said it was for a mirror finish.
Any thoughts?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-29-2014, 05:08 PM
TucsonJay's Avatar
Registered User
 
Last photo:
Join Date: Feb 2010
Location: Tucson, Arizona
Posts: 818
Wiki Edits: 0

Thanks: 0
Thanked 99 Times in 77 Posts
My first thought is to add a little slow reducer, so the paint can flow out some after it is brushed on. If it is too dry, or you keep brushing it as it dries, it might flash before it "lays down".
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-29-2014, 05:42 PM
Registered User
 
Join Date: Dec 2009
Location: illinois
Posts: 375
Wiki Edits: 0

Thanks: 1
Thanked 32 Times in 32 Posts
As was mentioned , thin it just a bit , I never use a brush , instead I use a piece of cotton " cheescloth" , in a pinch just about any clean , soft cotton cloth will work , just fold it up & then grip it so it looks kinda like a ball, dip the ball in the varnish & spread it out. the varnish you're using is "self leveling" so you have to apply enough to make it flow , don't overwork it or you'll get marks. I've been building cabinets & finishing wood this way for about 40 years , my grandpa taught me some tricks...
dave
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-30-2014, 11:07 AM
jcclark's Avatar
The Penny Pincher
 

Last journal entry: Hanging Bumpers
Last photo:
Join Date: Dec 2004
Location: Louisville, Ky. U.S.A.
Age: 61
Posts: 1,877
Wiki Edits: 0

Thanks: 4
Thanked 19 Times in 16 Posts
the more you slow it down, the better it will flow.
Some even add retarder.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-04-2014, 04:49 PM
mitmaks's Avatar
Member
 

Last journal entry: Grille
Last photo:
Join Date: Sep 2002
Location: Washington
Age: 31
Posts: 1,599
Wiki Edits: 0

Thanks: 4
Thanked 10 Times in 10 Posts
you can spray it out to eliminate brushmarks. Once it dries you can wetsand and buff it out just like you would with automotive clear coat, just make sure you put enough material on there to compensate for sanding.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-11-2014, 07:12 PM
chief36chevy's Avatar
Registered User
 

Last journal entry: Done (or is it?) cont.
Last photo:
Join Date: Sep 2010
Location: Annville, PA
Age: 63
Posts: 122
Wiki Edits: 0

Thanks: 29
Thanked 2 Times in 2 Posts
Thanks for all the advice.
I waited for a few days for the urethane to dry so that I could sand it. I started with a DA with 120 grit and followed with a long block with 120 then 220.
I then reduced the urethane by 10% with mineral spirits and spraied them with a HVLP gun and it came out much better. I figure that I will wait a few days and block it with 320 and respray it untili have enough built up so that I can wet sand and buff.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 07-13-2014, 09:04 PM
mitmaks's Avatar
Member
 

Last journal entry: Grille
Last photo:
Join Date: Sep 2002
Location: Washington
Age: 31
Posts: 1,599
Wiki Edits: 0

Thanks: 4
Thanked 10 Times in 10 Posts
Quote:
Originally Posted by chief36chevy View Post
Thanks for all the advice.
I waited for a few days for the urethane to dry so that I could sand it. I started with a DA with 120 grit and followed with a long block with 120 then 220.
I then reduced the urethane by 10% with mineral spirits and spraied them with a HVLP gun and it came out much better. I figure that I will wait a few days and block it with 320 and respray it untili have enough built up so that I can wet sand and buff.
120 grit is too course, you could start with 320 dry, put another 2-3 coats and wetsand that starting with 400 or 600 and finishing all the way to 3000 if you wanted to. Just dont take off too much with rough grit, otherwise you got the right idea.
Reply With Quote Quick reply to this message
The Following User Says Thank You to mitmaks For This Useful Post:
chief36chevy (07-14-2014)
  #8 (permalink)  
Old 07-16-2014, 09:13 PM
Registered User
 
Join Date: May 2014
Posts: 21
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Why would you start with something as harsh as 120 grit? I'd say 400 would be as low as you need to go, and just take off smaller layers. I want to see some pics when it's done!
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 07-17-2014, 07:06 AM
Member
 
Last wiki edit: Ford axle ratio codes
Last journal entry: Rear Suspension
Last photo:
Join Date: Aug 2005
Location: Prattsville
Posts: 6,382
Wiki Edits: 31

Thanks: 2
Thanked 56 Times in 52 Posts
I would only use Epifhanes spar varnish.. Any wooden boat builder/ restorer, knows quality varnish counts
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 07-17-2014, 11:27 AM
ogre's Avatar
the 'Duracell Project'
 
Last photo:
Join Date: Nov 2009
Location: Motown
Posts: 1,411
Wiki Edits: 0

Thanks: 0
Thanked 107 Times in 95 Posts
don't use a da sander either, a soft block or sand paper on a thin rubber pad will be good
i'd hit it lightly with dry 320 sanding with the grain and then add a few more coats of poly then 320 and 400
hand sanding with the grain and 400 will never show scratches, buff or wax to get a mirror finish
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 07-17-2014, 03:40 PM
chief36chevy's Avatar
Registered User
 

Last journal entry: Done (or is it?) cont.
Last photo:
Join Date: Sep 2010
Location: Annville, PA
Age: 63
Posts: 122
Wiki Edits: 0

Thanks: 29
Thanked 2 Times in 2 Posts
Clear the air

Please let me clear some stuff up. I refer you to my original post. I did say that I started with a brush which gave me brush marks. I used the 120 to remove the brush marks and then went to 220 and then 320 before I tried to spray.
Since then I am getting much better results.
What type of polish would you use on Minwax Helmsman Spar Urethane?

Last edited by chief36chevy; 07-17-2014 at 03:56 PM.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 07-18-2014, 04:27 AM
jcclark's Avatar
The Penny Pincher
 

Last journal entry: Hanging Bumpers
Last photo:
Join Date: Dec 2004
Location: Louisville, Ky. U.S.A.
Age: 61
Posts: 1,877
Wiki Edits: 0

Thanks: 4
Thanked 19 Times in 16 Posts
After all that trouble, you would have been much
better off using a automotive urethane clear coat.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 07-18-2014, 04:09 PM
chief36chevy's Avatar
Registered User
 

Last journal entry: Done (or is it?) cont.
Last photo:
Join Date: Sep 2010
Location: Annville, PA
Age: 63
Posts: 122
Wiki Edits: 0

Thanks: 29
Thanked 2 Times in 2 Posts
After 60+ years of life lessons (OJT) I am using most and learning some other new tricks along the way. This is my first hot rod project. I am learning a lot usually after the fact. I ran across this web site and I have used the heck out of it. The people are very helpful and once in a while I have been able to help someone out. I did not know about automotive urethane clear coat.
But thanks anyway.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 07-20-2014, 02:55 PM
Old Fool's Avatar
Registered User
 
Last photo:
Join Date: Jan 2008
Location: spokane,wa.
Posts: 1,347
Wiki Edits: 0

Thanks: 8
Thanked 40 Times in 34 Posts
I suggest using SPI Universal Clear next time, lots of guys have done that and had fantastic results.
Reply With Quote Quick reply to this message

Recent Body - Exterior posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
urethane and polyurethane dwhitt Body - Exterior 24 12-28-2012 08:04 AM
Does anyone here end with a mirror smooth (not a hint of gun texture) finish? 777funk Body - Exterior 12 07-14-2011 07:37 AM
Aluminum compents including cast alumunim can be detail polished to a mirror finish! Elite Metal Finishin Introduce Yourself 17 04-25-2011 09:34 PM
How to I prepare an acrylic enamel finish for a bc/cc finish? klingfilm Body - Exterior 2 10-12-2009 12:50 PM
Painting polyurethane WakBordr7387 Interior 9 07-10-2005 08:44 AM


All times are GMT -6. The time now is 07:07 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.