Painting order

Discussion in 'Fiberglass and Composite Boat Building' started by fallguy, Oct 15, 2019.

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  1. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    So, I am painting my hulls.

    2 coats of interprotect
    2 coats of Petit Vivid
    2 coats of Epifanes primer
    2 coats of Epifanes 2 part polyurethane

    or so I hope

    skip the coatings critique; the boat is all epoxy, so not really needing a ton of interprotect and I like the Epifanes

    the question is all about the order of things

    I had planned the following.

    1. Paint two coats of Interprotect 2000 to 3" above dwl.
    2. Sand the Interprotect with 180 and mask off at waterline.
    2. Paint two coats of Epifanes primer and fair as needed.
    3. Finish the top with 2 part poly to waterline.
    4. Mask off to 3" above waterline and sand topcoat and apply bottom paint.


    The downside to this plan is the entire interprotect will require sanding to prep for the ablative.

    Any advice?
     
  2. Blueknarr
    Joined: Aug 2017
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    Blueknarr Senior Member

    Fair before priming. Two coats of primer will only give you a few mils of coating to play with. It would be more "smoothing"than fairing.
     
  3. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    sorry, it should say touch ups, but it has nothing to do with the overall question

    our major fairing work is complete on the first hull
     
  4. Blueknarr
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    Blueknarr Senior Member

    You planned well.
     
  5. Blueknarr
    Joined: Aug 2017
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    Blueknarr Senior Member

    Fallguy,

    A word of caution.

    If you sand thru the primer, re-prime. Do not apply finish paint over un-primed areas.

    One of the purposes of primers is to provide a surface of uniform density and porosity. Substrate density and porosity can affect paint's sheen. Spotty priming often results in splotchy finish appearance.
     
  6. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    Yes. I know this bit. Thanks as well.
     
  7. E350
    Joined: Sep 2015
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    Location: Sacramento River Delta, CA

    E350 Junior Member

    fallguy or others: I am here to learn not to critique, so please be patient. I believe that I sourced the Epifanes 2-part polyurethane finish coat you mention:

    https://www.amazon.com/gp/product/B00TUNJRN4/ref=ox_sc_act_title_3?smid=A2ZO16S61GUQY7&psc=1

    Your hull is epoxy, the finish paint is polyurethane. So which Epifanes primer is the best to use: epoxy or polyurethane?

    Epifanes Epoxy Primer:
    https://www.amazon.com/Epifanes-Epo...imer white&qid=1571251583&s=automotive&sr=1-2

    Epifanes Polyurethane:
    https://www.amazon.com/Epifanes-Pol...imer white&qid=1571251872&s=automotive&sr=1-1
     
    Last edited: Oct 16, 2019

  8. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    epoxy primer---stinky stuff
     
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