I have recently bought a damaged repairable MX5 just to keep me out of mischief. The wing mirror mechanism that allows it to be turned in manually has been broken and even second hand ones for a Mk3 are expensive. Can anyone recommend a very good plastic adhesive that I can use. I recon to be able to drill and use long self tappers but need the adhesive as a back up strategy at the same time.

Apparently JB Weld is very good. They do different glues for different applications. I've just bought some JB original because I've read that it can be used to fill in pitting marks prior to powder coating.... Not had a go yet so we'll see whether it works or not...😊

tbh I usually just use a soldering iron to fix car plastics, just as simple as welding. Unless you can identify the type of plastic and the solvent for it, this maybe a better solution. Saying that I broke the Fiesta's adjuster and since I was the only one going to drive it just glued the mirror on in the right position with some tiger seal

If it's a clean break in the plastic then I've generally found Loctite superglue pretty strong. The break does need to be clean though as the glue is not a gap filler, just a means of bonding parts. I've bonded bit of SWMBOs wing mirrors back together using it successfully (bits of the kids plastic toys too).

Ask your local motorcycle workshop to see if they have any as INOTEC produce a 2 parts adhesive that an be drilled and tapped, probably not worth buying the kit as it’s very expensive but worth getting them to do it ? Think it’s INOTEC Topfix

Model shops often sell small bottles of a solvent adhesive for plastics - look for shops that sell posh/expensive plastic model kits. Use a brush to paint the stuff along the crack and, when the plastic softens, hold the edges together until the plastic hardens again. Doesn't work with every type of material, but it's very effective when it can.

It's effectively plastic welding.

I think David’s referring to Tensol liquid cement which is fed into joints via capillary action. We have had a fair bit of success with the hard plastic glue bought from either Toolstation or Screwfix

Good glue ..stelmax ..

[Edited on 7/1/19 by johnemms]

If there is room, build up behind the crack with fibre glass, had worked for me.

Devon Plastic welder, like a 2 part epoxy but will even stick "ungluable" plastics. Rebuilt a smashed door mirror cover on a Kadett GSi back in the day and was tough as hell and lasted donkeys years