Jump to content
CBR1100XX.org Forum

Conformal coatings


XXitanium

Recommended Posts

Ok..couple of things in conformal coatings of PCB's.  

1)  You can only keep the PCB as dry as it is when you coat it.  The PCB absorbs moisture and needs to be baked at about 150 - 200 F for min of 3 hrs to really cook the moisture out of the board.  Coating without baking..will trap moisture and can help to cause failure..not prevent it.

 

2)  Anti-static.  Ground the board and yourself when spraying.  You can't use too much, but make sure you layer and coat it like a you would paint a car...but liberal use is just fine.

 

3)  Dry.  Let it really dry.  Another baking is just fine.

 

In my days manufacturing industrial sensors..they used Humiseal quite a bit and that is where I learned the above practices.  Full potting is the best option..but Humiseal is pretty good.

https://m.skygeek.com/humiseal-1a33-humiseal-1a33-aerosol-conformal-coating-11-5-oz-can.html?utm_source=googlebase&utm_medium=shoppingengine&utm_content=humiseal-1a33-humiseal-1a33-aerosol-conformal-coating-11-5-oz-can&utm_campaign=froogle&gclid=Cj0KCQjwyYHaBRDvARIsAHkAXcsKR7F8ignRfRqM2xc_TB7f1J5vcZfvg5kDXX5g1L9Xed1w1IQxeRMaAijfEALw_wcB

 

Link to comment
Share on other sites

...hmmm, I let the board get tacky. I saturated the wireways and slathered them in dielectric grease. My thought was that water would have a hard time getting in if it had to push grease out of the way.

 

It started and we put about 40 miles on it. I think I'll do the windshield / seal - and see if I can get six months more out of it.

 

23 hours ago, TuffguyF4i said:

3)  Dry.  Let it really dry.  Another baking is just fine.

 

This stuff resembles WD-40. It did talk about drying in the instructions though.

 

I suppose I trapped propellents and solvnts in there...

Link to comment
Share on other sites

  • 3 weeks later...

This shit is pretty amazing.  I will never be without it.  The incident Oscar was talking about was with my sea planes and the home-built boats where I wanted to use non-marine electronics.  This makes them totally reject water.  Submerging the electronics does nothing to them.  I use it on things like fence hinges and latches, or anything that's outside and needs corrosion protection that seems to last "forever."  Years I guess.  It's a thick foamy oily coating.  I've used it on anything on the boat that looked like it was hinting at oxidizing.

 

Oh, there are two types, I use the red.  I can't remember what was different about the blue label.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

Terms of Use