why does my pinline do this.

ok this dosent happen everytime but sometimes when im doing paint pinlines, and i hotcoat over them, it seems like the line repels the hotcoat…sometimes just certain spots, and sometimes the whole line… sometimes it will look fine but then its just like its only the wax left on the line and the resin has been pushed away…

i have tried many different things but it seems to be pretty random when it happens, usually ill have to do the pinline 2-3 times before its all gone.

ive tried cheap paint , good paint, let the line sit for 10 minuits before hotcoating, let it sit for 2 days before hc…ive touched all over the line with dirty hands, ive kept my hands off of it. these in any combination, and it could or could not happen on any given line…its very irritating… you might not know whats causing it but is there something im missing that will prevent it.?

Hey have,

Sand the line ever so lightly with 240 dry paper. I think you’ll find that you’re problems are over as a result.

Mahalo, Rich

thanks, i might try that sounds like it could work …i just dont want to mess up the line, but it should be fine if its light i guess. i was kindof thinking maybe if i brushed over just covering the edge of the line with a thin layer of lam resin that could also help? then hc over that…?

Have, I feel your pain. But Rich is right. A light sanding will do the trick, and it’s quicker and less mess than a resin-related fix.

Also, you can try using Posca or Zig paint pens to do the color for the pinlines. Just paint between the tape. The amount of paint will be minimal, and will cause less problems.

Personally, I use Liquitex right from the tube as illustrated on the Harbour Surfboards website. The paint goes down thick, so sanding it to a dull finish is not problem. One tip: If you do it this way, pull the tape right away before the paint skins over. Doug

well looks like sanding it did help, but still looks like i have a few problem areas, but at least its not the whole thing …yet.

Have, What paint are you using for the pinlines? In the past, when I’ve had the problems you are describing, it was from either a turned-up sharp edge on the pinline, or a glossy area of paint on the pinline. As always, water-based acrylic is best. And a flat finish. Doug

the good liquitex…not the basics…i just looked again and it looks really good, none of the little craters i normally might get. but theres still something wrong, the hc thats not on the line is good and hard , but some of it on the line appears that i could scrape it off with my fingernail… i guess ill have to do what i normally have to do…sand lightly over the line to remove wax, then hc again…and wait some more…ugggg. i need this thing done.

Have, If you don’t have too many problem areas, you can fix them after the hotcoat. Just wipe the indentations with an acetone dampened paper towel, then drop some new hotcoat resin into the low spots. They will overfill, but no problem. After resin hardens, you can pre-sand or file down those areas, and then sand the hotcoat as usual. Doug

yeah thanks man, but it really all looks pretty smooth its just i think i could scratch areas off easily like if i press on it with my nail it will leave a mark… and im pretty sure its as hard as its ever gonna get, ive had to do this before and its usually fine after that, maybe its just the hc is thin over the line and the paint lets me scratch it off …i dont know but if i think it still needs it ill just go over it again, just pretty much right over the line… thanks for the help.

I airbrush my pinlines a few coats and then go over it with a scotchbrite pad (lightly). I also use the paint tube / squeegee method, but this leaves a very thick line which I sand using 400 on the edges and to level it. Try resin pins, you don’t have to overcoat them.

Resin pinstripes cool…

Have a tactile besides visual feel.

Hi Doug Is the harbour clip still around? can you remeber the link or the title of the post the it was on I can’t seen to findit but your post just jogged my memeory that I’ve been meening to download that for some time.

Cheers in advance.

Woody, go to www.harboursurfboards.com and look at the right side of the home page. There is a list of surfboard-building steps, with the pinlines about half way down. It shows a neat little video of a very skilled pinline guy. Doug

yeah thats how i do my lines like in that vid… sanding them down really did make a big difference , there wer just so small spots that diddnt take so i went over all of it just to keep it even and to be safe with the rest… I used to do resin lines , and then switched to the paint thinking it was easier, i keep trying to convince myself of it , but the more i do them i dont think its any better, i will probally go back to the resin lines… hell i might even post a pic of the finished board so you guys can see what you had a hand in…

Maybe I can get some advice for my pin-line problems too! Using Liquitex I got some of the same wet spots described, but I also got a bunch of bleeding from the pin-lines. This occurred about two days after I laid down the lines. I sanded it off (gloss coat too) and did resin pins. Sometimes my resin pins bleed too!

I’m blaming it on slow kicking Silmar gloss resin. Maybe too much styrene? I use 1 cc per oz. same for MEKP and it still takes 30-40 mins. to kick.

Help please!? Thanks in advance.

Lance, Don’t use such a thick coat of paint on the pins! If you watch the Harbour video, you’ll notice that the paint is squeegee’d so that it is the thickness of the tape on each side of the line. That’s still fairly thick compared to airbrushed lines which I let dry 2-3 days. If you go with the tube/tape/squeegee method, I would double the drying time. On any painted or inked lines, I recommend using an overcoat of clear acrylic (flat) before glassing. Make sure that the painted lines are indeed dry before you clearcoat. In colder weather, I use a hairdryer or heat gun.

This is an old thread but I’m dealing with the same issue as Have did. Put a acrylic pinline down on the sanded hotcoat of two boards and lightly sanded the lines then glossed them. The gloss coat thinned out and the lines repelled the gloss. So I sanded the area again and tried patching the line with gloss resin. But it repelled it again. So I said screw it and sprayed polycrylic sealer over the board later to find that the sealer was easily rubbed off which I’m guessing from the gloss coat being sanded at 320 grit. Removed the sealer then sanded back to 120 and glossed the board, this timeusing 30cc for half quart of gloss. Still repelled. I officially hate pinlines. Plan on doing the next pinline under the hotcoat since the gloss is so thin. Figured id try and get some help on here. Thanks in advance.

You keep thinking it is the resin or acrylic sprays fault.

 It's your paint. There's probably some form of shit in your paint that the resins does not like.

Brand of paint? all paint is not equal. was it flat or gloss paint?   India ink, zig pens, etc.. is the best if doing paint pinlines, comes in all colors etc. Make sure it is waterproof.

Also putting the paint on too thick will mess with resin.   Remember the resin will saturate into the paint, and mess with the chemistry crap of the resin. Light paint pins, with solid quality paint will work.  Also certain colors will mess with resin.   I hate red paint.  never have any problems with black?