pva’d the mold a few weeks ago and brushed on ploy gelcoat today,after about 3 hours i returned to find this.the mold is only 1mm deep,the part is a flat plate but i made a mold for easy cut lines.the gel seems to have briged the step as well as these strange lines…
another pic
I have never seen that before?
Are you saying that the gel coat is only 1mm thick? If it were thicker than that, I could say that was contributing to the cracking. Also, are you running your mix hot or cold? Meaning, 1%, 1.5%, 2%, etc.
it was around 1.5%.i mean the drop from the flange to th ebase of the mold is 1mm,i dont know how thick the g coat is,i just brushed it on.
Did you store that mold in a hot place? I’ve had PVA pull away from a mold when it’s overheated.
i’ve had something like that happen, for me it was old gel coat, and the other time it was old catalizador.
well i peeled it off today and im non the wiser,the surface againat the mold is super smooth and i cant ‘feel’ the cracks,they appear to be on the isde of the gel coat you would laminate onto.strange. :?
what type of surface coat are u using??? it happened to me when i used polyes. gel coat… not good for painted parts. it will peal and criple your plug. even if u have wax or a release. MIGHT worked if u use PVA but im leaving the gel coat world… to stinky, and not good to work with if its not sprayed.
might be whats happening here