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  #1  
Old 02-14-2018, 08:16 AM
1bigdog 1bigdog is offline
 
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Default Sika 207 vs 209 primer

In discussion with a Sika rep a fellow builder was advised 207 may be a better choice for the application rather than 209.

207 appears to be the auto-glass variant where
209 is for marine application.

207 is the only primer required for both metals and the acrylic rather than multiple primers.

209 has a caveat about UV whereas 207 does not in the data sheet.

Has anyone been using 207? Any comments or concerns?

Thanks.
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  #2  
Old 02-14-2018, 08:53 AM
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mike newall mike newall is offline
 
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You are bonding organic glass (plastic), so 209N is the more correct primer.

http://www.ecfibreglasssupplies.co.u...aSheet/825.pdf
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  #3  
Old 02-14-2018, 11:06 AM
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Have a read thru this thread:
http://www.vansairforce.com/communit...ad.php?t=40089
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Old 02-14-2018, 01:11 PM
1bigdog 1bigdog is offline
 
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Default still wondering about 207 vs 209

Hi Noah

I read the whole thread and many others.
Too much anecdote and too little fact.

I think we agree that's where we are trying to get to.

I was very specific with Sika and I consider their responses relatively specific (given they have no aviation application). 209 is specific to the acrylic. I am bonding to bare aluminum and steel. 207 does all 3. In the sika chart preparation requires 3 things to bond to all 3;

scuffing, 205 and 207. The rep was helpful in that they provided the specific areas from their marine application data and from their auto-glass references (their tips & tricks). Their conclusion was largely that 210 was not required, and 207 was the preferred solution for using 295UV.

We are where we are because the adhesive qualities appear to be such that some people are being complacent because it works well as there has not been an incident. I am stripping the powder coat off to make sure adhesion is as intended.

The question still remains if we have experience with 207 vs 209.

This isn't meant to be a debate rather a fact finding question (and yes, I understand the irony of that statement).

Thanks for all the help.

Michael
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  #5  
Old 02-14-2018, 02:44 PM
rv8ch rv8ch is offline
 
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Default bonding to what?

Most people on the forum are using Sikaflex to bond the canopy or windscreen to the roll bar or canopy frame.

Are you saying that you are using Sikaflex to glue aluminum and steel?

That might explain the disconnect.

For plastic to the steel frames, I've used SIKA PRIMER-209 N.
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  #6  
Old 02-14-2018, 04:18 PM
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mike newall mike newall is offline
 
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Sika suggest different primers for different substrates but you are still gluing organic glass to whatever substrate so I am with Mickey - 209N.


BTW - is this a different primer wars or the same as usual ;-)
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  #7  
Old 02-15-2018, 07:25 AM
1bigdog 1bigdog is offline
 
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Default sorry for the disconnect

Quote:
Originally Posted by rv8ch View Post
Most people on the forum are using Sikaflex to bond the canopy or windscreen to the roll bar or canopy frame.

Are you saying that you are using Sikaflex to glue aluminum and steel?

That might explain the disconnect.

For plastic to the steel frames, I've used SIKA PRIMER-209 N.

Hi RV8

sorry if I was not clear. I'm bonding the acrylic to the the bare steel frame, and I thought some had bonded the aluminum skirts to the canopy as well.
In your case I'm assuming you only used 209 because you left on powder coat.

Hope that clarifies.

Michael
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  #8  
Old 02-15-2018, 07:28 AM
1bigdog 1bigdog is offline
 
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Default not a primer war

Quote:
Originally Posted by mike newall View Post
Sika suggest different primers for different substrates but you are still gluing organic glass to whatever substrate so I am with Mickey - 209N.


BTW - is this a different primer wars or the same as usual ;-)
I swear, I'm peaceful. No primer war intended.
Sika rep recommended 207 over 209 given bonding acrylic to bare steel, and acrylic to bare aluminum. So I was just asking about 207 experience.

Cheers.
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