Sika 207 vs 209 primer

[1bigdog]

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.

[mike newall]

You are bonding organic glass (plastic), so 209N is the more correct primer.

http://www.ecfibreglasssupplies.co.u...aSheet/825.pdf

[Noah]

Have a read thru this thread:
http://www.vansairforce.com/communit...ad.php?t=40089

[1bigdog]

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

[rv8ch]

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.

[mike newall]

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 ;-)

[1bigdog]

Originally Posted by rv8ch

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

[1bigdog]

Originally Posted by mike newall

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.

[Reilly]

Hi
Any further info on this topic?
I am bonding canopy to bare metal. I have the 209d to use on the canopy sides but should I use 207 on the metal sides or is 209d ok?

Reilly

[mike newall]

Try this as a compare and contrast...