adhesive for stickin metal fire trim to render

Harold Davis wrote in news:XnsA4282B1615D5harolddavis@213.239.209.88:

Just in case this isn't enough information: the trim will be around the fireplace opening for an unenclosed solid-fuel fire.

Harry

No experience of it, but this sounds up to the job

"Our products are supplied to many industrial users as well as well-known household names such as Aga Cookers and Baxi Heating"

There are a couple of reasons why all this may not last long. First is the different expansion rates of the two materials you are trying to attach to each other, the other is that one assumes the fireproof render is at the end of the day m basically cement, which is not strong for anything but compression, it might just separate from itself and come away on the trim after a while. I'm pretty sure when I last looked, which was admittedly a long time ago now, that most of this sort of thing was actually attached when the render was being applied or it was screwed through the render to the wall underneath. That is not to say of course that a wonder material has not appeared more recently! Brian

Could you screw magnets into the render, then the trim would hold itself on by magicnetism?

Owain

"Phil L" wrote in news:%6tvw.271096$ snipped-for-privacy@fx15.am:

Thanks for this.

The trim is decorative. The front face of the chimney breast has been covered with heatproof render (Vitcas) and then 'tiled' on top with 20mm thick brick slips secured with adhesive (Nicobond Quickfix). I have left some leeway at the edges of the fireplace opening, about 25mm each side, and was planning to pack that area with render to leave a flat surface a few mm away from where the trim will go.

I'm no expert, but I have to question what you say about nothing sticking to render other than plaster. The manufacturers of Nicobond Quickfix say it will stick to render:

and I've found many positive reviews saying it has been fine for doing what I've done or similar.

They also say it will stick to steel when mixed with an enhancer (?). Maybe I should use render to make a surface under where the trim will go and then butter both trim and that surface with (enhanced) Quickfix? The thought hadn't occurred to me before. The problem is that whereas it can take the heat that will be experienced by the chimney breast, I am not sure whether it could withstand the higher temperatures experienced by the trim.

Harry

Hello! I was wondering did you ever find a solution? I have the same question now in 2020 and have not had much success so far. The trim has loosened and come off. Many thanks!

ICBA to look at the forum, but perhaps a non-setting mastic (frame or gutter sealant, etc) might work?

I find epoxy works well for most applications and I would expect it to work well here.

Car body filler is cheaper and probably better

Car body filler would stick well to a (rough) render but would it stick to a smooth piece of metal? However if car body filler was used and the metal surround falls off there would be a smooth car body filler surface where the metal came away from and sticking the smooth metal to this smooth surface would be easier with some other form of thin film glue.

My experiment glueing a concrete slab with two part (car body) filler The final photo shows one side of the slab clamped to the arm of a bench whilst the other side is loaded with bricks.

Well that is precisely what it was DESIGNED to do! Cars are generally made of 'smooth bits of metal'

It is far more likely to rip the surface of the render off.

However if car body filler was used and the

It wont.

there would be a smooth car body filler surface