Spraying Gel - 9:1 vs 13/15:1 - Possible???

Discussion in 'Fiberglass and Composite Boat Building' started by fantastixvoyage, Apr 10, 2025.

  1. fantastixvoyage
    Joined: Jun 2011
    Posts: 4
    Likes: 1, Points: 3, Legacy Rep: 21
    Location: West Michigan

    fantastixvoyage New Member

    Curious if anyone has sprayed gel with a 9:1 system with any luck? I know 13 or 15:1 is preferred but just curious if it would work out ok in a pinch for one project while I sort out a new replacement for a gel-specific option. This would be sprayed into a mold for a mid-sized boat, not a repair. Thoughts?

    Also if you had to choose between 9:1 spray system or pressure pot (pre-mix) which route would you choose? Thanks!
     
  2. ondarvr
    Joined: Dec 2005
    Posts: 3,034
    Likes: 641, Points: 113, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    It can be used with good results, but your tip size needs to be reduced and your ability to keep a wet edge comes into play.

    What is a mid-sized boat in your view?
     
  3. fantastixvoyage
    Joined: Jun 2011
    Posts: 4
    Likes: 1, Points: 3, Legacy Rep: 21
    Location: West Michigan

    fantastixvoyage New Member

    Boat is 28’ so quite a mold to consider using a pressure pot on so I’m leaning towards the 9:1 system. Just arrived so going to try some small parts first.

    was looking for feedback on anyone that’s used the 9:1 with gel and had success.
     

  4. ondarvr
    Joined: Dec 2005
    Posts: 3,034
    Likes: 641, Points: 113, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    Keeping the gel coat warm will help a great deal. I used an 11:1 on parts that size with excellent results, but I used an inline heater most of the time.
     
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