Do Not Mix Humbrol Clear Gloss Varnish with Windex...

Discussion in 'Hints & Tips' started by Gary, Oct 12, 2018.

  1. Gary

    Gary Will the real Gary please stand up... Staff Member Administrator

    Messages:
    4,647
    Likes Received:
    511
    Joined:
    Dec 5, 2015
    A member of 'British Railway Modelling in Australia' (facebook page) accidentally found out why you don't thin Humbrol Clear Gloss Varnish with Windex. Watch the video to find out why...



    Cheers, Gary.
     
    Kimbo likes this.
  2. Paul-H

    Paul-H Full Member

    Messages:
    31
    Likes Received:
    7
    Joined:
    May 7, 2018
    Not sure why you would want to thin it, as its already like water?
     
  3. Gary

    Gary Will the real Gary please stand up... Staff Member Administrator

    Messages:
    4,647
    Likes Received:
    511
    Joined:
    Dec 5, 2015
    As Ian said (at 54 seconds), when he sprayed it on, it went all blotchy...

    Cheers, Gary.
     
  4. jakesdad13

    jakesdad13 Staff Member Moderator

    Messages:
    2,795
    Likes Received:
    425
    Joined:
    Dec 14, 2015
    I could be wrong, wouldn't be the first time!, but to me it sounds like the varnish bloomed, it sometimes happens when the area where you are doing the spraying is a little too cool.
    As I say I'm probably wrong, but it is worth remembering that paint sprays better at room or a little above temp.

    Cheer's, Pete.
     
  5. TimberSurf

    TimberSurf Full Member

    Messages:
    405
    Likes Received:
    213
    Joined:
    Jun 20, 2018
    And here are two more factors that may have affected it:-
    Humbrol website
    "Application
    Shake well before use - some settlement may occur. Apply thinly with a brush or airbrush. To achieve a higher level of the desired finish, apply additional coats. Do not use in temperatures below 15ºC or in conditions of high humidity to avoid the appearance of a cloudy finish once dry."
     
  6. Gary

    Gary Will the real Gary please stand up... Staff Member Administrator

    Messages:
    4,647
    Likes Received:
    511
    Joined:
    Dec 5, 2015
    Ian is a pretty credentialed modeller and lives in Perth, Western Australia. The weather there has been warm throughout the week of the air brushing. He has air brushed and weathered many model previously and this is the first time this has happened. It is also the first time he has mixed both the Humbrol product with Windex. Ian uses Windex for thinning various other acrylic paints and has not suffered the same issues.

    Cheers, Gary.
     
  7. Chatty

    Chatty Full Member

    Messages:
    55
    Likes Received:
    11
    Joined:
    Mar 23, 2018
    On some other forums the use of Windex has been used as a thinner for various paints.

    However, I have never been one to advocate the use of thinners other than the thinners from the manufacturer of the paint.

    I have too many things go wrong including ruining a model that I had spent a lot of time building. Sure the manufacturer's thinners may cost a few pennies more but trying to reclaim or salvage a model cost a lot more in time and money.

    Kind regards

    Geoff
     
  8. SMR CHRIS

    SMR CHRIS Staff Member Moderator

    Messages:
    3,060
    Likes Received:
    288
    Joined:
    Dec 31, 2015
    I’m thinking the windex may have a small water content that will work ok with a colour paint as will slow the flash off of the solvent but with the clear this will result in the cloudy finish as when it’s applied in high humidity
    With clears I try and stick with the manufacturers own thinner if it’s not the same as other generic thiners
    Still not sure why using windex instead of specific thinners ??? Trying to save a few $$$ may be but if you find a supplier most products can be purchased in bulk at a very good price
    eg isopropyl alcohol I get a 5.2L bottle of 100% for the same price of the 70% 500ml bottle at the local hardware then decant and cut as require
     
  9. amdaley

    amdaley Full Member

    Messages:
    9
    Likes Received:
    3
    Joined:
    Aug 29, 2018
    Glad you were able to get it back to something like normal.
    I suppose the lesson for us all here is to try it on a scrap piece first.
    Tony.
     

Share This Page