Model: 99998: Kyosho
Status: How To Guide
Date: 21-Mar-2017
Comments: 7
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So I picked up this tattered lexan Kyosho nostalgic Cobra shell from eBay for a very reasonable price. It was hit really hard and torn up pretty bad in the front and to make matters worse the Kyosho Nostalgic shells are very thin as you get down to the bottom. Those of you that have them know what I mean. Luckily the sides and back of this body are fine. The previous owner decided to use clear packing tape to mend everything back together and it took a very long time to remove that tape and the old residue along with all of the old decals too. I saved the stripe decals for reference to measure for later- and was able to peel off and salvage the cobra emblem decal!!......... So, I've only done one other lexan shell like this that was in this poor of condition. My technique involves cleaning the shell extremely well first so there is no oil or residue left behind. You do not want dirt, oily film, decal goo, overspray or anything on it when you start. To be sure after you think it is all good, do a full wash with de-natured alcohol and then do it again. To get going on the patch repair do an aggressive scuffing on the backside with course sandpaper first. Use fiberglass cloth and epoxy resin to strengthen everything back up cutting each piece to lay in nicely like a quilt of fiberglass. It is critical to get the fiberglass to conform to the shape as much as possible with no big air pockets. One way to insure this includes taping the body back together on the outside with masking tape and then begin 'tacking' your fiberglass woven cloth on the inside using CA glue on the corners of each piece you lay down, don't use too much CA. When the CA sets up (or use kicker) when dry this allows you to move and spread/push the epoxy around with a plastic spoon or scrap of flexible plastic and get the resin thru the fiberglass with everything nice and tightly 'wrapped'. If it is your first time doing this stuff wear rubber gloves. Remember to make sure the CA glue is minimal and you are only tacking your pieces in place so the epoxy can fully do its job................. I am experimenting this time with a different type of filler on the outside. I'm using regular Bondo for the heavy areas that will interface with the roughed up lexan and exposed fiberglass where chunks of lexan were missing. For the rest I'm actually trying modeling putty on the thinner areas. It seems to grab extremely well to the lexan that is sanded with 320 and 400 grit sandpaper first. Now, with the stiffness put back into the body with the fiberglass repair it allows me to use squadron putty (used for styrene model kits). The front of this body is as stiff as a molded plastic ABS hard body, otherwise without the stiffness of the fiberglass to support the putty it would likely crack. So far so good, with a lot of tedious wet sanding up into 600 I will get it smooth, and after enough primer soaks into the repair area it will take paint evenly on the outside with the rest of the scuffed and primed shell. This Cobra will live again!! scollins





























before I started I may choose this color combo

If you liked those pictures, you should see these...
vintage Kyosho lexan needing repair!

Comments

IronSights

21-Mar-2017

Very well done.
Correct me if I am wrong, but you probably don't want to use as a runner unless at slow speeds. If you hit something al that Bondo would just crack again right?

scollins

21-Mar-2017

Actually, if done correctly this could be used as a runner with no issues. Of course if you hit something hard at full speed it will probably crack,,,but maybe not too badly. The better you prep the lexan and have good fiberglass technique it may only crack a small amount in a crash. I plan to fully run this and save my mint body for more shelf duty, actually.

yogi-bear

21-Mar-2017

that is looking to be quite an effect repair. I would never have thought of repairing lean that way, so I will have to try it at some stage on some old bodies I have.

AndyjcClod

21-Mar-2017

Wow thats impressive. I have done some minor repairs on a ABS body but nothing like this. Looking forwards to seeing the finished job.

scollins

21-Mar-2017

Thanks guys,,,when shells are this rare, a lot of people look to strip them and repaint them from the inside. This is fine,, but when bodies are damaged this bad, priming and painting on the outside is the only way!

emspjay

21-Mar-2017

Looking good! I have a ton of experience with fiberglass and body work but never would have thought to use it on a lexan R/C car body. Great idea to save these rare body's!

Crash Cramer

22-Mar-2017

Spring little Cobra get ready to strike...... Hey little Cobra don't you know you're gonna shut em down.


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