Does 914 rubber sell the recommended adhesive for gluing the vinyl to the sail panels.

Most home stores, Amazon, etc carry the 3M spray.

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DO NOT use Gorilla Glue in a spray can. I used it on the dash board in summer, already pealing off in the cold.

I prefer to use Wurth high temp spray adhesive.
We will be stocking it soon but are not there quite yet

I"ve always used 3M Super Trim adhesive. Just don't try and glue the whole thing at once.

Carefully position it and use some masking tape to hold it, as well as masking off the entire area so you don't get adhesive where you don't want it. Then fold the top half down and spray both surfaces and let it dry the time listed on the can. Gradually smooth it up from the glue line working back and forth smoothing as you work your way up. Then fold up the bottom half and repeat the process. If you try and stick it all at once, you'll probably get a wrinkle or air bubble

While I’m not experienced at sail panel adhesion, my $.02 on the 3m is it will eventually fail with a situation that sees a lot of sun/heat. I use a lot of 3m adhesives (90, 94, Fast Bond 30) in my profession and they seem to always fail after several years in outdoor applications. IMO they do not withstand the temp extremes that a sail panel may be exposed to. Again, just my opinion and experience with various applications using contact adhesives outdoors.

so what do you recommend?

Us east coasters never get that much time to have our cars out in the sun.

Will you glue over the paint or sand it down first? What's the preferred install?

Factory I believe, glued over primer surface, that was splashed around the edges with body color overspray. I’ve used this over the years, with great success, or any good quality rubber cement.
Register the sale panel material to the panel, apply glue to both surfaces, completely, and let dry, then adhere.

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I would say, as above with the Wurth, any old school, solvent based, rubber, contact adhesive would be your best bet. Proper adhesion to both surfaces is the critical aspect. The sprays bond to themselves well, but let go from one of the substrates under extreme conditions suck as heat or continual temperature cycling. 3M fast bond 30 has given me the best results as it a rubber based contact, but still questionable under extreme conditions. Older solvent/rubber based contact adhesives bonded to various substrates much better, IMO. I’m not really sure what’s available outside of California though. We only get stuff that pregnant sea turtles can eat without being harmed.
I would also go with at least a Scotch Brite scuff sand to help the bond.

Again, JMO

This is a great vinyl adhesive and not affected by heat cycles.
https://www.amazon.com/HH-66-PVC-Vinyl-Ceme...230&sr=8-13

also has a thinner available to shoot thru a spray gun if you choose.

Stay away from the spray cans

I understand the eco dilema with spray cans, but I can tell you that the home mechanic with limited experience will have better results with a spray, than brush on. It's easier to get it nice and smooth with a spray application, and easier to get lumps with a brush on. You can guess how I know this

My upholstery guy who is the local Porsche club guru says most people who have failures, are using too much.

Just did this a few weeks ago with @SocalAndy and his method is to scuff the paint with a Scotch pad for adhesion.

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looks great!

Weldwood landau top adhesive. Withstands high heat. Unfortunately you can only buy a gallon...but it's worth it. Great for seats, dash tops and sail panels. Use a cheap HF spray gun and wear a respirator. Amazon link below

https://www.amazon.com/Dap-Weldwood-Contact...38931&psc=1

Great discussion on this, thanks.I’m getting ready to redo my sail panels as a winter project.
My take away is not to use spray adhesive and scuff sand prior to gluing.
I’m pretty sure I’ll use “ Worth”

Likewise, this has been on my to-do list for the better part of two years. Maybe I'll finally get it done this winter.

After repairing some rust on my sail panel and trying my hand at painting the roll bar and sail panels (with some success), I am ready to put the new 914 Rubber vinyl on as well as the new targa pad.

Problem is, looks like 3M 90 is getting really hard to find. It's out of stock at all the big box stores it seems, and Amazon has really limited buying options. Is this COVID, VOC's, or some other culprit I wonder

Any other spray adhesives people recommend? I could do the brush on contact cement if needed, but it seems like there's more room for error with this method (per Perry's comment previously).

I experienced the same problem trying to source the 3M 90 Super adhesive spray. I did find it on eBay from a seller and it took about 1 week to arrive. Cost me $50.... but that is the price you pay for the good stuff some times. Good luck in your search.

Ok this all helps thanks. So I have filled in the holes to mount the lower chrome strip as they promoted rust and am planning on attaching the strips with a strong double sided tape after putting on the sails. Any suggestions?

3M trim adhesive tape. Works great.

Anybody know why this is? I guess it doesn't matter, but it seems a mystery that it rather suddenly is unavailable. The guy at Lowes told me they had it in stock until a few days ago, and now you can't even order it online. Curious. Maybe the massive pipeline supplying 3M 90 to the East Coast was hacked.

No other spray adhesive ideas?

Michael, I've got my roll bar back to Irish Green (just like yours). One day it will be all Irish Green with 16 in Fuchs, although it will have a Type 4 in it, not a six. I'm sure nobody will be able to tell our cars apart

I used this. Claims to be resistant to heat failure.

https://www.yourautotrim.com/welatopandtr.h...TBoC120QAvD_BwE

3M Hi-Strength 90 Spray Adhesive, Permanent, Bonds Laminate, Wood, Concrete, Metal, Plastic, Clear Glue, Net Wt 17.6 oz, Will Spray Upside Down https://www.amazon.com/dp/B004M8SHWY/ref=cm...=UTF8&psc=1

"Usually ships within 1 to 2 months"