Poly-Tone vs Enamel

Discussion in 'Finishing Techniques' started by TJay, Feb 22, 2017.

Help Support HomeBuiltAirplanes Forum by donating:

  1. Feb 22, 2017 #1

    TJay

    TJay

    TJay

    Well-Known Member

    Joined:
    Jan 18, 2014
    Messages:
    201
    Likes Received:
    130
    Location:
    Maurice IA
    Ok getting ready to spray my fiberglass cowl, Wondering if I should use the poly-fiber Enamel product or just use Poly-Tone, Looking for experience here who has used what, Does the enamel chip off? Is the color match and sheen the same? Thanks TJay
     
  2. Feb 22, 2017 #2

    Rockiedog2

    Rockiedog2

    Rockiedog2

    Well-Known Member

    Joined:
    Dec 12, 2012
    Messages:
    2,175
    Likes Received:
    1,508
    Maybe you have read what the PF manual says about PolyTone over metal and fiberglass. If not, here it is

    Poly-Tone
    has had mixed success over
    primed metal and fiberglass. Sometimes
    it lasts for years, sometimes it peels off
    in months.
    Poly-Tone
    is optimized for
    fabric, although many builders choose
    to use it on metal for its ease of applica-
    tion and ability to melt into previous
    coats.
    The good news is, if it comes off, it’s
    really easy to put right back on. So some
    builders find it convenient to just use
    Poly-Tone
    for everything. If they have to
    respray a cowling every few years or so,
    so be it.
    Poly-Tone
    is the easiest paint
    to apply we know of, and it blends to a
    perfect match

    I've always used Aerothane on the metal/fiberglass parts but I've always used Aerothane(2 part urethane wet look) on the whole plane until this last one and I went with silver Polytone and left the metal parts raw AL. I recently painted the wheel pants with the same silver Polytone and that looks great. Perfect match in both the semi gloss finish and the color. The Aerothane stands out like a sore thumb next to Polytone(high gloss vs satin) and is way expensive in comparison. But the pants haven't had the PT on them long enough to know how it's gonna hold up, sorry. The Aerothane is tough and I haven't had any problems with it so long as the prep was correct.
    For the money and ease of application I'm gonna stick with the PT and hope it holds up; if not I'll fix it. I haven't used the one part enamel that PF has out now so am no help with that if that's the one you're talking about. The description sounds like it's a close match to Polytone
     
  3. Feb 22, 2017 #3

    Kyle Boatright

    Kyle Boatright

    Kyle Boatright

    Well-Known Member

    Joined:
    Nov 12, 2012
    Messages:
    722
    Likes Received:
    358
    Location:
    Marietta, GA
    The polytone experts I know claim to have "solved" the "doesn't always stick to fiberglass and metal" problem.

    They swear by using an epoxy primer, then applying Polytone while the primer is still tacky.
     
    TJay likes this.
  4. Feb 22, 2017 #4

    Rockiedog2

    Rockiedog2

    Rockiedog2

    Well-Known Member

    Joined:
    Dec 12, 2012
    Messages:
    2,175
    Likes Received:
    1,508
    I just reread the description on the one part enamel and it says it's a wet look like aerothane.

    >>>A one-part, air-drying alkyd enamel coating available in 50 colors to match Poly-Tone and Aero-Thane. It air dries to a high gloss similar to our Aero-Thane polyurethane, but is not as chemically resistant as Aero-Thane. Intended as a topcoat paint over metal or composite surfaces that have been primed with EP-420 Epoxy Primer. Do not use Enamel over fabric or on structures that will be covered with fabric cemented with Poly-Tak adhesive. Poly-Tak will lift enamel.<<<
     
  5. Feb 22, 2017 #5

    TFF

    TFF

    TFF

    Well-Known Member

    Joined:
    Apr 28, 2010
    Messages:
    11,291
    Likes Received:
    3,103
    Location:
    Memphis, TN
    Color matching and sheen matching of car paint is going to depend on how good the car paint store is and how good you put it on. The auto enamel is set up to be more shiny, like your car, car paint ya know. There are ways to flatten it out but a real pro is needed to match perfect. The plus of car paint is it will stick. Most new fiberglass and metal airplanes are painted with PPG. Aerothane is just dandy on metal and fiberglass, but it is shiny like car paint. If it needs to be the same, same , same, you will have to take the chance on Polytone; I think fiberglass would do OK because there is some tooth to the surface vs metal. I will also say if you want it to really match, you are going to have to spray the Polyspray on the FG; what pant sits on makes a difference on how the color comes out.
     
  6. Feb 22, 2017 #6

    TFF

    TFF

    TFF

    Well-Known Member

    Joined:
    Apr 28, 2010
    Messages:
    11,291
    Likes Received:
    3,103
    Location:
    Memphis, TN
    Oh Stits Enamel; nah.
     
    Rockiedog2 likes this.
  7. Feb 22, 2017 #7

    BBerson

    BBerson

    BBerson

    Well-Known Member HBA Supporter

    Joined:
    Dec 16, 2007
    Messages:
    11,523
    Likes Received:
    2,141
    Location:
    Port Townsend WA
    I had Polytone unstick from metal struts. No thanks, won't use again.
    Urethane is the best match (if you can afford it and the toxicity) to cover fabric, metal and fiberglass with same paint.
    The waterborne isn't as bad to breath.
     

Share This Page

arrow_white