Nice effort , No matter what hardener you use you still have to de pot the resin onto your work or a plate as soon as possible.
Finish one side completely , first one layer , let harden, clean up opposite side early if necessary , then 9 more. Wax the new side a couple times , especially the edges/creases, of part to mold, then light coats of hairspray to perfection and you should be fine. I did another run with just resin when the edges came out really shitty and the mold came out best ever.
A mast takes 2 or 3 hours for me to layup , so time is a factor but multiple batches of medium speed will not get out of control
I still have meltdowns regularly, try not to breath the smoke, I bet it is not healthy! Has anyone seen flames ,really??
PLA mast mold worked pretty well. I got impatient at the end and the mold warped, but the mast seems good to me. I did overfill the mold so the mast is a good eight inch wider than intended.
Spurred by my success I tried a fuse mold with a little more patience. It came out better but the mold still had a small amount of warping. Small waves formed where I can see the pattern of the support material underneath.
I am printing a plate mold with a thicker outside layer, 1.2 mm to try next.
I have a mold for a mast that is .75 inches/2 cm thick. It's made of PLA plastic that softens around 150 f / 70 c. I am thinking if I lay it all at once it'll exotherm and melt the plastic. Is this a valid concern?
Nice mould Opie,
You could try designing in a water cooling pipe channel next time?
Or print the model and cast the mould in polyurethane or silicon rubber? That's worked well for me.
Or use a slow cure epoxy, some are designed for a post cure to fully harden and won't exotherm much.