Tooling gelcoat residue on molded part?

Discussion in 'Fiberglass and Composite Boat Building' started by itchyglass, Aug 17, 2023.

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  1. itchyglass
    Joined: Aug 2022
    Posts: 37
    Likes: 2, Points: 8
    Location: MA

    itchyglass Junior Member

    So I have a mold for a part that I have pulled 8 or so parts from... all going perfectly. Currently I apply one coat of wax before each part. However after pulling a part last light I noticed some of the red tooling gelcoat seemed to transfer over to the parts white gelcoat. I was able to lightly wet sand the part with 1000 grit, polish and buff away the red smears. It was only an issue in one small area.

    My only thought is maybe I am not mixing up the gelcoat enough before spraying? Thus some styrene is etching its way into the tooling gel? Any tips are greatly appreciated!
     
    itchyglass, Aug 17, 2023
    #1
  2. KD8NPB
    Joined: Mar 2018
    Posts: 163
    Likes: 39, Points: 28
    Location: South Carolina

    KD8NPB Senior Member

    Overspray on the mold from another mold you made nearby? Or possibly an area of the mold you repaired?
     
    KD8NPB, Aug 30, 2023
    #2
  3. itchyglass
    Joined: Aug 2022
    Posts: 37
    Likes: 2, Points: 8
    Location: MA

    itchyglass Junior Member

    Have not made any new molds recently. The problem only happened on one part! Recent parts have not any issue... the mystery continues but for now problem solved!
     
    itchyglass, Aug 30, 2023
    #3
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