By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

Stuart Castings - Issues

All Topics | Latest Posts

Search for:  in Thread Title in  
Haforn16/04/2020 16:17:05
5 forum posts

Guys, sorry if this sounds like a daft question, or if it's in the wrong thread

I've just bought a set of castings for a Stuart S50. Back in the day (40 years ago) I bought castings for a Stuart Beam. The old castings were beautiful, crisp, smooth, and needed barely any cleaning up. The new ones are ropey, to say the least. No inclusions or blow holes, but the surface quality is dire. Even the word "Stuart" around the crank on the base casting is barely legible.

I gather that the casting technique has changed over the years; Stuart say the casting I've got is 'standard'. I've managed to file away most of the roughness but the sides of the base casting are proving difficult to get smooth.

My plan was to use acid etch primer on the cast iron base casting prior to painting. I'm now thinking of smoothing the sides with something like JB weld beforehand.

My questions are - does anybody have any recommendations for a smoothing filler? Is JB Weld a bad idea?

Also, if I do use JB Weld, will the acid etch primer destroy it?



JasonB16/04/2020 17:14:32
23088 forum posts
2774 photos
1 articles

JB Weld is a good adhesive but a pig to rub down, you would be better off with an easy sanding car body filler such as one of U-pol's offerings or good old P38.

Rather than etch primer use a high build filler primer such as U-pol's "High-5"as that will fill the small imperfections that the epoxy filler can't, rub that down then prime with whatever colour primer suits your topcoat before applying that.

Have a look at these old post of mine where I show the stages I go through. here and here

Haforn17/04/2020 10:27:08
5 forum posts

Thanks Jason, and thanks for the pics. Ordered some U-pol stuff this am on Amazon, I'll give it a whirl

Lambton17/04/2020 11:47:23
694 forum posts
2 photos


I have sent you a PM (

look for the flashing INBOX tab towards the left of the green band at the top of the this page.)


All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at

Latest Forum Posts
Support Our Partners
Eccentric Engineering
Rapid RC
Eccentric July 5 2018
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest