Go Back  RCU Forums > RC Airplanes > Questions and Answers
Reload this Page >

How Do You Get A Smooth Finish With Polyu

Notices
Questions and Answers If you have general RC questions or answers discuss it here.

How Do You Get A Smooth Finish With Polyu

Old 08-09-2013, 06:33 PM
  #1  
chuck l
Thread Starter
My Feedback: (17)
 
Join Date: Nov 2002
Location: Goodyear, AZ
Posts: 1,427
Likes: 0
Received 0 Likes on 0 Posts
Default How Do You Get A Smooth Finish With Polyu

What technique do you guys use to apply a light, smooth finish with Polyu (Polycrylic) on Koveral. I've tried foam brushes and high quality bristle brushes but can't seem to get a good finish. How wet do you get your brush, light pressure, heavy pressure, what angle do you how the brush, one stroke, multiple strokes, back brush????? Describe the technique that works best.

Chuck
Old 08-10-2013, 01:29 PM
  #2  
Campy
Senior Member
My Feedback: (1)
 
Campy's Avatar
 
Join Date: Jan 2002
Location: Baltic, CT
Posts: 3,613
Likes: 0
Received 0 Likes on 0 Posts
Default

The 1st thing is to make sure the surface you are going to poly is GLASS SMOOTH - (if it isn't glass smooth you will not get a smooth finish). Then I normally spray the poly on. Your spray setup will determine the pressure and amount of thinning you will need to use. (A tip - when you can spray a VERTICAL piece of glass without any sags, runs or orange peal, you are ready to spray the plane.)

FWIW - Oil base poly WILL start to yellow in about 6 months (or less). Water base poly WILL NOT yellow. A poly finish is fuel RESISTANT, NOT FUEL PROOF.
Old 08-10-2013, 07:48 PM
  #3  
chuck l
Thread Starter
My Feedback: (17)
 
Join Date: Nov 2002
Location: Goodyear, AZ
Posts: 1,427
Likes: 0
Received 0 Likes on 0 Posts
Default

Campy,

Are you trying to fill the weave by spraying the poly or are you just spraying a coat over the paint? I'm trying to fill the weave before applying paint.

Chuck
Old 08-12-2013, 08:33 AM
  #4  
gene6029
 
gene6029's Avatar
 
Join Date: Sep 2007
Location: wilson, NC
Posts: 1,219
Likes: 0
Received 11 Likes on 7 Posts
Default

Chuck, I found for me to get a smooth finish,I fill the weave with rattle can sandable primer. This may take several coats with sanding off most in between coats. When i'm finished, its smooth as glass & ready for paint. You can vary this if you want some areas to look like fabric with some visable weave.....Gene
Attached Thumbnails Click image for larger version

Name:	100_0064.JPG
Views:	23
Size:	1.21 MB
ID:	1907236   Click image for larger version

Name:	100_0065.JPG
Views:	17
Size:	1.18 MB
ID:	1907237   Click image for larger version

Name:	100_0238_0001.JPG
Views:	21
Size:	2.33 MB
ID:	1907238   Click image for larger version

Name:	100_0236_0001.JPG
Views:	17
Size:	2.18 MB
ID:	1907239  
Old 08-12-2013, 12:24 PM
  #5  
kenh3497
 
kenh3497's Avatar
 
Join Date: Jan 2010
Location: Rockwell, IA
Posts: 1,508
Likes: 0
Received 0 Likes on 0 Posts
Default

Like Campy says... the base surface has to be smooth first. If it's not smooth anything on that surface seems to be magnified buy the following layers. I find 320 grit to be "smooth enough" to lay glass and WBPU over.

Ken

Posting Rules
You may not post new threads
You may not 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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.