No, you can still use gelcoat, especially on curved surfaces which are much easier to do - the gelcoat is only very thin anyway so it doesn't build up noticably. On a flat surface a larger bluff in area would be required to ease any changes in depth or colour but even this can work really well if you sand back first to give half a mill of depth to the gelcoat.
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Re: Best paint for topside repairs.
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