Gel-coat & Polyester Primer
+ Reply to Thread
Results 1 to 10 of 10

Thread:
Gel-coat & Polyester Primer

  1. #1
    Senior Member customtouch's Avatar
    Join Date
    Nov 2008
    Location
    Austin Tx
    Posts
    127

    Default Gel-coat & Polyester Primer

    Is it okay to spray gel-coat over a (polyester) primer (after it is sanded and prepped of course). In the paint world you have to use a polyester primer over any raw fiberglass instead of a urethane primer to keep it from printing back through later and I know it is in the same general family as fiberglass and gel-coat since it uses the same hardener. That being said, I am wondering if the gel-coat would adhere to it and if anyone has done it before. I know it would not work over a urethane primer or paint but I have a unique circumstance where it would be to my advantage to do this if possible. I have plenty of experience with paint but not much with spraying gel or it's limitations. Thanks.
    Last edited by customtouch; 10-12-2012 at 04:29 PM.

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Banne'd Cobra1's Avatar
    Join Date
    Feb 2008
    Posts
    2,568

    Default

    Gelcoat is tinted resin (poly based) , they start out with a base color, and add tinting from there. Did you use Duratech primer, that's the good suff. Get some PVA and fog it good, better than adding wax. You need to cut the air off from it to get a solid cure. Other wise sanding is going to be a PIA.




    You will need a 2.5 tip to spray it, it can be thinned a bit with tone or styrene.
    Last edited by Cobra1; 10-13-2012 at 07:23 AM.

  4. #3
    Senior Member customtouch's Avatar
    Join Date
    Nov 2008
    Location
    Austin Tx
    Posts
    127

    Default

    Quote Originally Posted by Cobra1 View Post
    Gelcoat is tinted resin (poly based) , they start out with a base color, and add tinting from there. Did you use Duratech primer, that's the good suff. Get some PVA and fog it good, better than adding wax. You need to cut the air off from it to get a solid cure. Other wise sanding is going to be a PIA.




    You will need a 2.5 tip to spray it, it can be thinned a bit with tone or styrene.
    Thanks, but I am not looking for information about the gel itself. My question is whether it is compatible with polyester primers. They seem to share somewhat of the same basic resin structure so I am trying to find out if it is possible to use gel-coat over polyester primers without adhesion issues.
    Last edited by customtouch; 10-13-2012 at 10:56 AM.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Banne'd Cobra1's Avatar
    Join Date
    Feb 2008
    Posts
    2,568

    Default

    Plain english I guess. Glecoat is Polyester Resin, it will work.

  7. #5
    Senior Member OFFSHORE GINGER's Avatar
    Join Date
    Apr 2008
    Location
    West Mich
    Posts
    1,565

    Default

    C.T. ,i sent you a PM and to tell you the truth i have not used anything other then Duratec primer for the last 20 years and yes the Poly Primer should work, and just curious what make or brand name is it , and is it made by EverCoat ?

  8. #6
    Senior Member customtouch's Avatar
    Join Date
    Nov 2008
    Location
    Austin Tx
    Posts
    127

    Default

    Quote Originally Posted by OFFSHORE GINGER View Post
    C.T. ,i sent you a PM and to tell you the truth i have not used anything other then Duratec primer for the last 20 years and yes the Poly Primer should work, and just curious what make or brand name is it , and is it made by EverCoat ?
    Yes, the primer I happen to have in stock at this time is Slick Sand by Evercoat. This just a unique situation where 90% of a repair is where paint will be and the rest will need to be gel (divided by a paint line). I wanted a primer compatible with both and did not see a reason that it wouldn't work but thought I would ask.
    Last edited by customtouch; 10-13-2012 at 03:26 PM.

  9. #7
    Senior Member OFFSHORE GINGER's Avatar
    Join Date
    Apr 2008
    Location
    West Mich
    Posts
    1,565

    Default

    Quote Originally Posted by customtouch View Post
    Yes, the primer I happen to have in stock at this time is Slick Sand by Evercoat. This just a unique situation where 90% of a repair is where paint will be (divided by a paint line) and the rest will need to be gel. I wanted a primer compatible with both and did not see a reason that it wouldn't work but thought I would ask.
    The Evercoat Poly Surface Primer ( slick sand ) will work just fine and have you ever given much thought about maybe giving Duratec a try , and one of the reasons i ask is because it comes in white , black , or grey.

  10. #8
    Senior Member customtouch's Avatar
    Join Date
    Nov 2008
    Location
    Austin Tx
    Posts
    127

    Default

    Quote Originally Posted by OFFSHORE GINGER View Post
    The Evercoat Poly Surface Primer ( slick sand ) will work just fine and have you ever given much thought about maybe giving Duratec a try , and one of the reasons i ask is because it comes in white , black , or grey.
    Thanks, I thought it should work but wanted to be sure. I hadn't given much thought to Duratec........but I will now!

  11. #9
    Senior Member OFFSHORE GINGER's Avatar
    Join Date
    Apr 2008
    Location
    West Mich
    Posts
    1,565

    Default

    Quote Originally Posted by customtouch View Post
    Thanks, I thought it should work but wanted to be sure. I hadn't given much thought to Duratec........but I will now!
    CT , i personnaly feel that if you were to try Duratec , it will be a little easier on the pocket book $$ which is $ 74.20 a gallon if purchased from www.expresscomposites.com and can be applied up to 50 mills wet on wet . Just a thought .

  12. #10
    Senior Member customtouch's Avatar
    Join Date
    Nov 2008
    Location
    Austin Tx
    Posts
    127

    Default

    Quote Originally Posted by OFFSHORE GINGER View Post
    CT , i personnaly feel that if you were to try Duratec , it will be a little easier on the pocket book $$ which is $ 74.20 a gallon if purchased from www.expresscomposites.com and can be applied up to 50 mills wet on wet . Just a thought .
    I used to use the Sikkens version of polyester primer but it is way over priced and not very user friendly. It was $80 or so a quart and very tempermental. If you put it on too thick or too fast would crack on you. The Slick Sand is a much better product that is way more forgiving and a gallon costs about the same as a quart of the Sikkens. I really like it so far but I have only used it a few times. I like the color options on the Duratec along with the mill capabilities and if you have had good success with it, I will probably order some the next time to see if I like it. I hope this doesn't come off wrong but I have built my business on the premiss of doing premium work at a premium price and while saving money is always a welcome bonus to me, the price is usually the last thing I look at when I am choosing materials for a job. It is just the way I am and if I thought the Sikkens Polyester was better, I would probably still buy it even at that price. I have had great results from most all of their other paint products that I have used and I have not had one warranty issue since switching to Sikkens paint about 21 years ago, even on the 150mph+ big cats I have painted, but their polyester primer SUCKS. I really appreciate your time & recomendation since I definately respect your opinion. I will give the Duratec a try next time the need arises. Thanks again.

    David
    Last edited by customtouch; 10-14-2012 at 09:41 AM.

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

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

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

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.


Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93