Electronics Forum | Fri Feb 24 07:28:11 EST 2012 | duso02
If you are going to coat very low volumes then just spray it by hand. The automated machines just won't be worth it unless you are going to do a very large run. They are complicated, require constant attention, still require masking the board and are
Electronics Forum | Fri Feb 26 10:42:56 EST 2010 | mleber
Your masking dots are a silicone adhesive. Contact the supplier and tell them you need an acrylic adhesive on the same dots. Normally same cost and lead time.
Electronics Forum | Wed Apr 19 16:43:05 EDT 2006 | samir
Silicone-based coatings "repel" most foreign,non-compatible materials like peelable solder mask, and rubber or vinyl boots. The result is, uncured material around the vicinity of where the boot was. Trust me. Been there and done that. As a rookie
Electronics Forum | Thu Feb 25 10:30:21 EST 2010 | davef
It sounds like your poly dots are secreting something that affects coating thickness. Is this a function of the adhesive used by poly dot supplier?
Electronics Forum | Fri Feb 26 10:34:03 EST 2010 | kpm135
If I had to guess I'd say they're using a silicone based adhesive.
Electronics Forum | Fri Feb 26 15:41:19 EST 2010 | kpm135
sorry jdumont I didn't see your post until after I posted mine for some reason. If I had seen it first I wouldn't have posted because yours covered it.
Electronics Forum | Mon Mar 01 09:17:56 EST 2010 | duso02
Hey....I think it might be the silicone adhesive! LOL Yeah, that'll do it. We use simple Shercon paper dots. Work like a charm. No evidence of "de-wetting".
Electronics Forum | Fri Apr 21 17:46:29 EDT 2006 | SD
First of all, do not use kapton tape! It tends to cause a dewetting effect around the tape. A call to Humiseal will explain why. There's not really a blanket answer to your question.... Removing cured liquid mask can often result in a fillet ef
Electronics Forum | Wed Apr 19 11:50:05 EDT 2006 | amol_kane
Hi BJ, Everyone's favourite answer...it depends! If the volume if large, masking boots will save you both, time and money in the long run. Custom boots are relatively expensive to buy, but they pay themselves over time by savings on masking tape. ma
Electronics Forum | Thu Feb 25 10:21:49 EST 2010 | jdumont
My guess would be that the adhesive used on the dots contains silicone. We use 1B73 which is also acrylic and it hates silicone. We use silicone RTV to permanently mask around some connectors and unless its fully cured before coating it will cause l
