Atomize with the gold!
3M makes a tape called Fineline..look it up. Its a plastic tape that bends around curves nicely. it comes in straight line tape and free hand. 1/16 - 3/4 inch.
Like mentioned sand to 320 or 400....lay down Fineline tape...burnish..do your business, pull tape
Everytime I see this thread I think it says Pipeline Masters. So where is the Pinline Masters held, haha??
"...Swaylocks.com, a strange message board filled with a cast of eccentric, underground surfboard builders..." - Slide Magazine
...if you sand finer like Atomized is saying, would be ok for posca and rapidograph pinlines but not so good for gloss coat over.
You can get a good gloss coat BUT after several rides (mostly on longboards) due to scratches and rushes when you seat on those longboards then standing up an reapeating these over and over, the gloss coat will peel off in some of these areas over the pinlines. ALWAYS
Just my 2 cents but after going through tons of different tapes I found the same as others have said here, PVC insulation type is now my only tape for pin lines. It bends beautifully around a full round tail without stopping and pulling it up at 45 degrees when resin still wet works perfectly. Any paper tape has a less than true edge. Here is one I just finished and I used cheap PVC electrical tape from Amazon - https://snag.gy/oXGRV3.jpg (ignore my slight mistake, fixed with a razor!), https://snag.gy/vr7QaJ.jpg
When the usual PVC tape (around 3/4 to inch wide) is a bit too wide, I found some "fine line" tape on ebay from China which was cheap as chips and worked a treat for delicate super fine lines or tight turns. https://www.ebay.co.uk/itm/Mix-Size-Fine-Washi-Masking-Tape-For-Nail-Art-DIY-2mm-3mm-4mm-5mm-6mm-x-25m/123209944728?hash=item1cafe28e98:m:mUPS6FTXWzxe1guxMf0bOSw
As I said, just my 2cents to add to what has already been said, anything with a paper edge will (in my view) need a razor blade sand along the edge which gets a bit tiresome
I cheat. I buy 1/8" auto pinline tape from the auto parts store and lay it under my glassing. Epoxy won't melt the plastic, and if it's under the glass it won't get sanded off or wear off.
Yep that’s an old tip from Greg Loehr. Trick is to get the tape to stick to the foam. Helps if you’ve sealed the foam with a skim coat of resin.
All the best
Personally I'm always ready to learn, although I do not always like being taught. - Winston Churchill