I have had this problem a couple of times and really don’t know how to prevent it. I used gloss resin with brown pigment for my pinlines (the yellow pinline did not bleed at all??). I cut the wax on the pinlines using a scotch bright pad and waited three days before applying the gloss coat. Within a few minutes of applying the gloss coat, the pinlines started to bleed as the gloss coat flowed out. Any suggestions… it is really frustrating to have a nice looking board with crisp pinlines that bleed under the gloss coat!!![img_assist|nid=1068340|title=Bleeding pinline|desc=|link=none|align=left|width=383|height=640]
what kind of tape are you using?
I use 3-m (its green…i believe it is the 233?). I’m not having a problem with the pinline bleeding under the tape. The bleeding happened when put the final gloss coat on the board over the pinline. Its almost like the gloss resin is “melting” the pinline resin and or pigment.
stir your pigments longer. it could be glob of pigment that are not quite kicked off.
Beyond that?
tape has nothing to do with it, over pigmenting is the usual culprit, solutions, add a few drop of wax solution to be sure the surface is sealed off, kick as fast as you are comfortable.
The acid test for bleeding pinlines is, does it scuff under fingernail scraping ? if you can get a bite on it, it will bleed, solution, tape a 64th around the line after scuffing and clear gloss it first, resand and gloss as usual, of yeah, I’ve had it happen a hundred times over the years, now I’m gun shy, check every time, hasn’t happened in decades
Yeah jim - after hearing that, I think you are spot on. Even after 3 days of sitting, the pinlines were still somewhat “soft”. Didn’t kick the brown off as fast a the yellow so I think that had a lot to do with it. I will definitely start checking first and the gloss/resand over the pinline is a great idea.
Luckily this board is for my wife so she thinks it is perfect anyway! However, I take a lot of pride in building boards and this board turned out great other than the pinline problem so it really hurts my feelings to polish this board like it is. Looks like the bleeding is not at the surface of the gloss coat and will not get better when I sand the gloss coat. So…how much of a pain in the ass will it be to sand off the gloss coat completely and pinline again - think I already know the answer but am I going to get into a mess if I try??
…it s exactly as Jim Phillips wrote, I can add, that no matter pigment, tint or paint, the closer to White (the color used) the less prone to bleed; opposed the other way around
As they said, too much pigment or not mixed enough.
I use a clean lightly soaked acetone rag and gently wipe 'em down until the rag doesn't pick up any more pigment. Any stray/unmixed pigment gets removed that way.
If you wanted to clean yours up you might try dragging the edge/corner of a razor blade through the gloss until the pigment streaks are gone. A steel ruler or smooth piece of sheet metal can be used as a guard against gouging your pinline.
Lightly scuff the surrounding areas, remask the inside edge of you pinline and at the rail apex and regloss the overlap panels. Depending on how many places are affected, it might be easier to scuff and regloss the entire rail.
If you're careful with 400-600 wet dry on a small sanding block and buff it out, you can eliminate the streaks and make the 'repair' invisible.
If you do overpigment again, you can always shoot a baste over the pinline before you do the gloss using UV lam resin. Re-tape if you have to. If anything funky happens, it can be easily addressed, rather than having to regloss.