Polyester vs Epoxy??

Discussion in 'Boat Yard Basics' started by Eric_Greenstein, May 3, 2010.

  1. Eric_Greenstein

    Eric_Greenstein I Love microskiff.com!

    Ok, i've searched and searched but can't find a reliable answer. I need to make a few repairs and maybe a customization on my gheenoe.

    Up top I have a crack in the front seat and a few holes in the seats from removed pedastal seats. On the bottom I have a small hole (hopefully its small, it may be a painted over monster) in the keel. May also remove starboard from transom and fill in a few old holes.

    I planed on using biaxial cloth along with west system 105 epoxy and 206 slow hardener. I started doing some research and it seems some folks use polyester resin/fiberglass with good results. The polyester is much cheaper and also comes with the catalyst. Down the road, I may also like to glass in a raised deck.

    What would the pros and cons be for epoxy vs polyester in these apps?

    Also, not sure if it matters but I would like to eventually paint the outside with Interlux Brightside.

    Thanks in advanced for your help.

  2. Brett

    Brett > PRO STAFF <

    Why type when someone else already has...


  3. firecat1981

    firecat1981 BBA Counselor

    The polyester is cheaper for a reason, it's usually used for popping plugs from a mold and covered with gelcoat or something to make it waterproof. Go with Epoxy for repairs, it's completely waterproof from the start.
    I've got alot of experience with interlux brightside, if you plan on beaching or fishing shallow water I'd go with perfection cause the brightside isn't very durable. but it is easy to repair when it rubs off.
    Thats my take on it.
  4. Eric_Greenstein

    Eric_Greenstein I Love microskiff.com!

    Awesome link Brett, thanks man. Looks like i'll use epoxy to be safe.

    How durable would you say the brightside is firecat? You can't scratch it off with your fingernail can you? I figure if I need to touch up the keel ever couple years its no biggie. Hell, who see's the keel anyway ;D Im not really looking to get fancy with this thing. I dont think the perfection is going to save the exterior of my boat from oysters.. Unless its some really good stuff? If I can get a decent paint job on her for 100ish, im doing good.

    Will a quart cover a 15' HiSi?
  5. noeettica

    noeettica Well-Known Member

    Welcome Flip...

    Photos Pleeeze ...
  6. firecat1981

    firecat1981 BBA Counselor

    The brightside won't scratch off that easily, but the first time you beach it will basically be half gone. Also if you drop a can of soda or something in the boat it might gash it. It's not bad for simple projects, but follow the directions and put on atleast 2-3 coats plus primer. I painted the outside of my old highsider with about a quart, if your doing inside and out I'd get 2
  7. DuckNut

    DuckNut Brandon, FL

    Welcome Flip.

    Where are you located? I have a few gallons here and would give some to you if your local.
  8. paint it black

    paint it black Paddling away...

    Those one part paints like Brightside can scratch and peel right off easily.
    They're a softer paint since they're non-catalyzed.
    Definitely go with Perfection.