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    • November 25, 2019 5:29 AM EST
    • I have only used coroplast for buildings. And for larger structures it needs some kind of internal bracing., It can bow or bend over time. I did use Axec square extrusions to make my bridge, and it is definitely more ridged, and glues up easier, but I cant say how sheets of it would work out since I haven't used any of them.

    • November 24, 2019 10:34 PM EST
    • There are differing formulas to be sure.  We get ours from 3 different suppliers. One brand, PA-Light is a very loose (larger bubbles) foam and has a somewhat pebble surface. Another brand, Komatex, is much denser foam and heavier. The surface skin is a very high gloss and the 48" tall sheets are actually over 49" with a formed semi bull nose edge. The third supplier we rarely buy from (higher price) shares characteristics of the other two; more dense like Komatex, but cut edges like PA-Light.


      At the local Lowes they sell Azek. I've not used enough of it to recall it's characteristics.  I think they also sell Royal which has a slightly different surface texture. I'm sure there are even more brands with varying characteristics.


      For use as a substrate for making vinyl signs the brand doesn't matter. But for CNC cut letters and decorative details like post skirts, we prefer the glossy finish of the Komatex.  For modeling, as a substrate, I would think the less shiny surfaces would take glue better. And if you are going to carve; you want the light stuff with larger bubbles. It bends easier, but cuts easier too.

    • November 24, 2019 8:49 PM EST
    • I'll wait for Jon R. to reply and clear this up for my mistakes....


      But .... There is variations of the stuff I (we) call Sintra, Azek & Komatex are just a few brand names.  And I would be only guessing the difference in charistics between the brands.


      All of what I call "Sentra" is of a uniform white composition all the way thru, and rather smooth on the surfaces .    Fairly soft to cut and carve.   I have also had some "Stuff" of the same like, that had a rather hard outer shell and fairly soft foamy inside that was used for signage.


       Jon R,  having worked in the industry would know better, and I hope that he chimes in and gives a better description of each product and such.


      Ding Dong.... Calling Jon R...


    • November 24, 2019 7:56 PM EST
    • Watching this thread hoping I may learn something.

    • November 24, 2019 7:29 PM EST
    •    I got some large free Sintra scraps from a sign printer here, but I had a heck of a time carving it. If you or Ray would fill me in on the best way to carve it, I'd appreciate it.


    • November 24, 2019 7:07 PM EST
    • SINTRA.....Much easier to work with and glue up.  You can even carve and texture the outside to look like brick, or random stone, or cut stone.  It is what I have used to make the master stones for the Mik's build challenge cut stones.  

      Do a  search for Ray Dunakin, and learn of the remarkable things he has done using it...  Truly a master of the medium.




    • November 24, 2019 2:45 PM EST
    • Ah, I stand corrected!  It turns out I HAVE used coroplast, I just didn't realize it.   But, I wasn't fond of it, as it required me to make the dimensions correspond to the "flutes'.   So there's basically a grain and if you need to make a cut diagonally or on a curve, it's going to be a lot more difficult than using PVC - which, I don't think really has a grain at all.   Easy to work with to get the dimensions you really want - not dictated by the material.  Jon has the right knowledge for this!

    • November 24, 2019 1:45 PM EST
    • I work in the sign industry and use these products daily.


      COROPLAST (corrugated plastic sheet).

      Sign industry uses both 4mm and 10mm thick sheets.  4mm is very easy to cut using a utility knife. If you are going to be cutting a lot, a Coro Cutter that has guides for the flutes makes it go fast.  For 10MM cuts we generally use a panel saw as it is pretty rigid.  For structure substrate, the 4mm makes for fast construction using simple tools.  End result is very light and may require added weight. Gluing can be tricky. I prefer a good quality double faced tape (3M VHB if you can afford it) over glue for Coroplast


      Lots of folks use it - search the forums. I think Ken Brunt has posted threads on methods.


      FOAMED PVC SHEET (Sintra, Azek & Komatex are just a few brand names)

      Available in many thicknesses. Sign industry uses 3mm, 6mm, 12mm, 19mm and 25mm (Roughly 1/8", 1/4", 1/2", 3/4" and 1") for various applications.  For structures 19mm makes a very robust substrate. Cutting anything thicker than 6mm requires a saw. Cuts and drills with wood tools. Ken's recent Mancos Depot thread shows his methods. All but the thinnest can take nails or screws. If you use screws, don't over torque as the threads will rip out. Lowes sells an Azek glue. Works great but it's pricey. A generic PVC Pipe cement costs a lot less and will work.


      For outdoor use, I think I'd probably suggest the foamed PVC board in 6mm or thicker as the superior product, It does cost more . If you have a local sign shop, you can beg for  scraps.

    • November 24, 2019 10:04 AM EST
    • Joe,

      Sounds like a fun project!   While I have just used generic PVC, I'm not sure it makes a lot of difference as none of them rot, plus they will be covered up anyway.   I can recommend a good exterior paint for the brick.   I've had very good luck with the custom samples you can get at Home Depot.  (Don't do Lowes as their samples are INTERIOR based).   When I built my firehouse I just used some PVC sheets I bought online.     Best of luck - I'm sure you will enjoy this!

    • November 24, 2019 9:27 AM EST
    • I have decided to take on a project to scratch build a firehouse for my club's holiday train display (WVMGRS at Brookside Gardens). (My first scratchbuild, btw)

      I would like to build a core structure, and then cover the core with a brick texture. Using this handy ppt: (,

      I decided that Coroplast or Sintra would be the best material(s) to use for the core, as they are easy to work with.


      So my questions are:

      - What are the advantages and disadvantages of each?

      - Does one have advantages over the other?

      - What do people prefer, and why?

    • July 30, 2019 8:31 PM EDT
    • after i had broken dozens of drills in the 1 to 1.5 mm range (about 1/25 inch), somebody recommended "IRVIN" drills.

      they cost double, but last more than thrice.

    • July 30, 2019 8:14 PM EDT
    • John,


      I got a set from "Bill the tool guy" at ECLSTS a few years back, and it's the same as this one, which has #61-80. Don't use it a lot, but it's worked when I have.


      I doubt it's as good quality as other ones, but the nice thing is that there's 4 or 5 of each bit in each little tube.


      FWIW, the blue plastic MM set ($20) appears to go for $4-$7, depending on how fast you want it, and with pin vise included, on Ebay. [link] If those are better quality, or if you're clumsy like me, you might get two or three sets... 


      [edit] Are you drilling metal, or wood & plastic? And how deep?


    • July 30, 2019 6:53 PM EDT
    • David I do the same works great on plastics and it doesn't elongate the hole, BB 

    • July 30, 2019 4:37 PM EDT
    • If I am drilling in wood or plastic, I take a piece of piano wire and sharpen the end to a flat chisel point, then taper the edges of the chisel point in partway. It works almost as well as a real drill bit, and I can resharpen it as many times as I need. It doesn't work well at all on metal.

    • July 30, 2019 12:15 PM EDT
    • John,

      Check out Tacoma Screw. They have a place in the Spokane Valley. You might need to special order the dril bits.

    • July 30, 2019 11:49 AM EDT
    • I've used Micromark's drill bits for years since I learned to resharpen them on the side of a separating disc.

    • July 30, 2019 11:14 AM EDT
    • If any one of you guys use them, I need a source of high quality *60 to *80 drill bits. I ordered 2 sets on Amazon and can only use half of them. (60 to 70)

      The tinier ones have no points and are useless. I left them a 1 star review.

      I suppose I could get Clevelands but I don't want to break my bank account.

    • June 30, 2019 6:26 AM EDT
    • Yesterday one of the newspapers mentioned APHIDS and what they excrete can strip the paint from a car if it is left underneath trees (particularly the Sycamore ) - as there are some types of aphids partial to that tree).....

      Apparently the excreted stuff is sticky..turns black and the paint soon deteriorates!

      (Which reminds old Triumph 1500 lasted years without  a spot of rust mainly due to parking next the  aircraft apron of the airport I worked at..unburnt jet fuel laid a film over the car preventing rust...just needed the occasional wash and repolish (like once a year). 


      Who would have thought bi carbonate of soda (baking soda) would strip paint off if used in a suitable airbrush. (Badger has one) but cheaper available on EBAY.