I have a Matchbox die-cast car that I took the roof rack off to make it look closer to the model I want. Issue is it left four small holes in the roof. I have lots of wood putty, but I don't think it will stick well enough to sand.
Any recommendations on a product to fill the holes. Will be sanded and painted.
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JB Weld or some other epoxy should bond and allow sanding.
JB Quick Weld is a great smooth spreading material that can be used as a filler….lightly scuff the areas around the holes, and fashion a small spreader from thin plastic, or even card stock …..let cure for half a day then sand smooth …
Pat
JB (Quick) Weld it is. Thanks!
Baking soda and Krazy Glue will also work in a pinch.
Mitch
I use JB Weld a lot. I save unwanted credit card offers for use in spreading/mixing any epoxy for “model-mods.” They are also useful when you need that 1/2” x 1” styrene piece and and don’t want to use a sheet…
"Marine Tex" also works well.
JW-Kwik would be my choice as well, I've filled lots of holes with it. I also glue lots of stuff together with it. 
Here's another product that our LHS has successfully sold for hobbyists...
Lots of different hobby groups use it to fill holes...in addition to other suggested uses in the link. Gamers like to sculpt with it, for instance.
It's particularly fun in our Michigan area!
The tape comes in 'maize and blue' colors (University of Michigan Wolverines) which, when kneaded together, turn 'green' (Michigan State University Spartans)!
The competitive analogy is not lost among Spartan fans in particular!...making the kneading process most enjoyable!!
So, for 4 small holes in a diecast car roof, you'd simply cut off about a 'booger's worth' of the blue/yellow tape, knead it in your fingers until uniformly green, smoosh it into the four holes, screed off the excess, let thoroughly dry, sand, paint. Pretty easy.
But, of course...TEHO.
KD
(Go Green, Spartans!)
I used model car putty (Testor's) with excellent results as demonstrated in this previous posting. With small holes, you wouldn't need to do the first three paragraphs:
Picked up a 1930 Agway diecast truck recently, but didn't realize it was a bank. I'm not fond of diecast banks for my layout and had to figure out a way to convert it to a smooth roofline. Obviously, the problem is that there's nothing for any filler to adhere to in the slot and it would just fall to the bank floor.
I used an old drywall patch technique and cut a small piece of .060 styrene a little thinner than the slot and about 1/4" longer at each end. I then reamed a hole in the middle with a hobby knife and inserted a tiny screw for a small pair of vise grips to grab onto.
After a couple of trial insertions of the styrene into the slot to make sure everything fit, I put a small dab of fast setting epoxy at each end of the styrene piece and, using the vise grips to securely hold it and not drop onto the truck floor, I inserted the styrene into the slot and pulled it tight up against the underside of the roof of the truck. I then carefully turned the truck over so that the weight of the vise grips held the styrene piece in place against the underside of the roof and waited 5 minutes for the epoxy at each end of the strip to set. Once set, I released the vise grips and removed the screw and let the truck sit overnight.
I then started applying filler into the hole (I used Testor's model putty) and kept filling and sanding (up to 1000 grit) to get the slot perfectly smooth and level with the surrounding roof. When I was satisfied that it was level and smooth, I applied a coat of grey primer and re-sanded any high/low areas and primed again. I then applied two (2) coats of Rustoleum Gloss White paint.
P.S. - the white "ring" in some of the pic's is just a reflection from the overhead LED light.
Body shop Glazing/spot filler, Usually in a small tube, it takes a while to harden.
@Mike CT posted:Body shop Glazing/spot filler, Usually in a small tube, it takes a while to harden.
I would agree. Bondo just like you would use if you had to do body work on your 1:1 car.
I like "Perfect Putty".
Always had great results with JB Weld Products, they even have worked great to filling in holes in the bumpers of my 1-1 scale 2000 Toyota Tacoma pickup!😁
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