Sika 227

**Tins** · 28th June 2025, 11:23 AM

I’m in the process of doing some bodywork on the OKA. The panels are basically 2mm sheet over a rhs frame. Originally they were spot welded and sealed with something like bathroom caulk I don’t want that and I would like to do away with the welds. There are of course a gazillion products that claim to be good for this. Someone suggested 227. Anyone have any experience?

**TonyC** · 28th June 2025, 11:45 AM

Ring the Sika tech line, I've found them very helpful, they will have something.

Tony

**p38arover** · 28th June 2025, 01:33 PM

Originally Posted by Tins

Anyone have any experience?

Wear gloves. It's a bugger to get off one's hands.

**V8Ian** · 28th June 2025, 05:34 PM

Originally Posted by p38arover

Wear gloves. It's a bugger to get off one's hands.

Both, I'd imagine.

**prelude** · 28th June 2025, 05:40 PM

Anecdotally I know sika to be fairly good stuff but I can't recall the number

the 227 seems to be more of a sealant than an adhesive though and reading through the product sheet I do not believe it is the best fit for your application.

For my own (4x4) camper I was provided with TEROSON MS 939. I reckon that the panels or aluminium will give way before the adhesive does. 3M also has something similar, a panel bonding adhesive. IIRC a car was once built with just adhesive in stead of spot welds and it turned out the be stronger in the end

Cheers,
-P

**oka374** · 29th June 2025, 07:04 AM

John there aren't too many spot welds most of them were just stuck on with a Sika like product. The ones I've repaired and removed all were just stuck.
Some of the cab ones I suspect are spotted but most of the big side panels on the bus are just stuck.
I've used Sika IIFC for most of my repairs and attaching solar panel mounts to the roof etc, they've (solar panels) not moved in 15 years.
For advice on specific panels Ian Jones might be able to assist as he supplies and repairs all of them.

**Lionelgee** · 29th June 2025, 08:42 AM

Hello Tins,

Take a visit to Sika's website. It should provide you with enough resources to be able to contact their help centre and ask some precise questions. Accessed 29th June 2025 from Vehicle Assembly Bonding, Body Panel and Structural Adhesives

Kind regards
Lionel

**Tins** · 29th June 2025, 08:46 AM

Originally Posted by oka374

John there aren't too many spot welds most of them were just stuck on with a Sika like product..

Mine are lifting, especially behind the coffin panel, so probably NOT Sika like......

I'm a little concerned that the unpainted RHS behind them won't be in great shape.

**prelude** · 29th June 2025, 05:37 PM

if the RHS is rusted, that won't hold so it might be that the adhesive worked well and is still sticking, but only to a bunch of rust that has let go from it's donor

-P

**oka374** · 30th June 2025, 06:41 AM

John when we bought 374 the oonly obvious rust was the passengers side coffin panel at the very top and the RHS frame rust had pushed out the sheet about 6mm.
i used a hacksaw blade down between the RHS and the sheet and kept cutting and "filing until the panel would go back into it's correct position. Then sucked lots of crap out with a small hose on the vac and then lots of sir into the gap to remove any remaining dust.
Then used a tube on the sika to force it down into the gap and then let the panel come back into place with lots of sika around the edges to seal it.
Then I dug out every roof seam and redid them all with sika then painted it. Didn't have any more leaks.
I also sika'd the roof rack mounting bolts and the sunvisor central mounts as well as resealing the windscreen with correct mastic sealant as i figured if the water couldn't get in then it would hold off the rust.
Lots of fishoil every few years also helps

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