Taping for second coats

[Guest]

How long should I wait before I tape over fresh powder. I'm on the third attempt to get this 65 grille done and I need to get it back to the customer soon.

Thanks in advance

[Guest]

Re: Taping for second coats

I usually just wait until the powder cools off past 100 degrees. Give it a few minutes after that then tape it off.

What kind of tape are you working with? Masking or high temp?

[Guest]

Re: Taping for second coats

I let the part cool also. Remember to remove your tape at flow out so you don't get any glue residue left behind.


Harley

[C3PC]

Re: Taping for second coats

I will be using the green high temp. I tried using the blue painters tape and what fing mess that turned into. Is it necessary to remove the tape after flow out? That is where all the trouble started.

Again thanks for the replies.

[Guest]

Re: Taping for second coats

I will be using the green high temp. I tried using the blue painters tape and what fing mess that turned into. Is it necessary to remove the tape after flow out? That is where all the trouble started.

Again thanks for the replies.

If you're talking about the blue or green painters tape, then YES, you must remove it before flow out. Otherwise it will start to melt and leave glue all over the place. It's a nightmare as I'm sure you've already experienced first hand.

The high temp stuff is usually pretty good through the first cure cycle. At least good enough to completely flow out the powder, get through curing, open the oven, slide the part out, wait for it to cool off for a few minutes then peel it off. I wouldn't leave it in there for any longer than 30 minutes at 400 as it tends to get really hard and cranks when you're trying to take it off. You can also just remove it after flow out and it's usually bit easier to deal with than the painters tape, at least in my experience.

[WhistlerCowboy]

Re: Taping for second coats

I have a ? about masking,after flow out and peeling off the tape what do you do to clean up any debris from the tape/powder that gets on the coated parts.Can you wipe with denatured alcohol at this time?Or do you use a small blast of air?

[C3PC]

Re: Taping for second coats

After the fiasco I had with blue painters tape I doubt I'll be using it again. I remove the high temp green as soon as the part cools enough to get close witout getting burned.

As for what to do with any debris from removing tape after flowout, sorry I can't help.

[Guest]

Re: Taping for second coats

I have a ? about masking,after flow out and peeling off the tape what do you do to clean up any debris from the tape/powder that gets on the coated parts.Can you wipe with denatured alcohol at this time?Or do you use a small blast of air?

MEK works great at removing over spray or small portions of powder before fully curing the part. Just wait for the part to cool down enough and wipe the area with a clean cloth and some MEK.

[BeeBob]

Re: Taping for second coats

I have a ? about masking,after flow out and peeling off the tape what do you do to clean up any debris from the tape/powder that gets on the coated parts.Can you wipe with denatured alcohol at this time?Or do you use a small blast of air?

Let the part completely cool and use short blasts of air to get off the extra trash. I wouldn't wipe it with anything until it's completely cured...

[Guest]

Re: Taping for second coats

Definitely don't use any chemicals to wipe off until fully cured. Take it from me been there suffered that.
I have left the high temp tape on through a full cure but it's a lot harder to remove. I also notice that the edgeing seems a lot nicer if you pull the tape around flow out.

Harley

[BeeBob]

Re: Taping for second coats

The sooner you can remove the tape, the smoother the edges will be. If the powder still has a chance to flow after tape removal it will lay down fairly smooth. If you wait until complete cure to remove the tape, the edges will be sharper and sometimes jagged if the powder sticks to the tape while removing it.

[WhistlerCowboy]

Re: Taping for second coats

Thanks for the help guys.