All,
I am looking to use Evergreen 4522 (pictured below) for industrial roofing purposes. The material is a sheet with grooves. Also included are very small (1/32" square?) ribs that are to be glued into these grooves to make ridges. They can be seen at the bottom of the bag.
My question: How do you glue these into the grooves neatly?
Does anyone have a technique they could share to do this without leaving messy glue marks?
Many thanks,
George
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George, here is a house I scratch built 30+ years ago in N scale using Evergreen’s appropriately sized material. I still have the rest of that package. As I recall, I put a puddle of CA on a piece of scrap and dipped a sewing pin in the puddle, then lightly spread the CA in the groove. I can’t imagine I did it any other way. The grooves are smaller than yours. My attempt at painting it to look rusty probably made slight fillets next to the strips.
Get a bottle with a needle applicator, fill the bottle with MEK, plastruct plastic weld, tenax, etc, put the rib in the groove, and apply a dot to the joint. It'll run along it and bond the parts. Leave the rib long and trim it once its set up.
@Mark Boyce and @Boilermaker1 - Many thanks gentlemen for the technique tips. I will salt them away for use on projects that aren't quite so large. By my estimation, I would need to apply these very small ribs to over 36 sections of roofing! 
Because, as we all know, discretion is the better part of valor, I have decided to use Plastruct 91512 which has the corrugated rolls molded into the piece. This project is already a do-over; I (in my eyes) marred a good building with a lousy approach to roofing. Life is short. Best to get on with an easy and more effective solution.
Thanks again for the tips - they may prove useful in later, much smaller projects.
George
George,
For styrene I now use pure MEK. Just use a small brush that's not useful for painting to pick up and apply enough to every joint. It'll wick into the joints and weld the parts together. Pretty unforgiving, so get everything aligned right the 1st time.
Good choice on the Plastruct material, George! I wouldn’t want to use the material you first mentioned on a large building either.
I use a pair of fine point forceps like a mechanical drawing pen with liquid solvent cement. I used to use Tenax 7r now replaced with Micro Mark Same Stuff. I believe both are Methylene Chloride. Dip the forceps in the liquid and close the points. A small amount should be retained. Then place the points next to the joint and gradually open the tips and the glue with flow out.
I started using this technique when assembling Intermountain HO kits. I could place a drop in the hole for a grab iron without it spreading much beyond the hole about .010” diameter.
Pete
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