New build in progress.

PVC wall panels for a shower room, with trims at corners. Some stud wall, some masonry external wall, all plasterboarded, skimmed, painted with Leyland Super Leytex.

What fixings would you use? (studs difficult to find)
Especially, what adhesive?
Will usual 12mm countersunk screws hold to plasterboard?

 

Edited August 16, 20224 yr by WWilts

I would just go for a cheap grab adhesive.  I used some Wickes stuff a couple of months ago for some skirting and it worked fine.

I would glue only, screws are leak and leach points.

solvent based contact adhesive .. Screwfix no nonsense is exactly to same as bostik 

We used the glue that the panel suppliers sold. Yeah, a few quid more but it was only a couple tubes and the joiner that fitted them said it was the stuff to use. Don't use screws!!!

Mermaid specified Everbuild Stixall Crystal Clear ( which is basically CT1 in a different tube from the smell of it ) for a 4x bathroom install I did where the clients went with Mermaid panels ( same 'glue' specified for both thin PVC and the Formica laminated wood alike ). 

Same product used to bed the bottom of the panels into / onto the shower / bath / floors etc, and PLEASE do not use the ghastly base trim they recommend, as it's a huge trap for water / grot etc and is completely unnecessary AFAIC. Also a horrible detail where it needs to stop short eg at the end of a fixed bath or shower tray.