Tal-1 restoration - paint amount?

[astrodan]

I recently unearthed my first scope, a Tal-1 (serial no. 0011, almost a prototype!) which I couldn't bear to part with despite ending up now with a lovely Tak 130. After sitting for years in my damp garage, it's in need of much tlc. Inspired by Astrobaby's excellent step-by-step guide like many others it seems, I've just started to follow her lead and do a complete overhaul.

The most obvious thing I have to attend to is the paint, with Hammerite Satin Black Spray and Rustoleum Appliance Spray, which are relatively expensive items. I don't want to waste any, but also don't want to be caught short between coats, so if anyone else has done the same overhaul, I'd be grateful for an idea of the number of (400ml) tins to get. 

Thanks,

Danny

[MarkAR]

The can should tell you the coverage. Hammerite says it will cover up to 0.5 meters sq.

Area will be Pi x diameter x length.

Edited March 20, 2020 by MarkAR

[Davey-T]

Hammerite satin black spray has useless coverage, like spraying water, better to use brush on and then run over it with a little foam roller to get a nice finish.

Dave

[DaveL59]

I've yet to make a start on repainting both the Tal-1 and the Tal-M was waiting on warmer weather till I get to that, so can't help the the coverage, but as Mark says the can should give an idea. Question will be how many coats you'd need to do. I was thinking along the lines of getting them powder coated but not sure what that'll cost or if its worth that expense. Plus there's something nice about doing the work yourself I think.

[MarkAR]

The Rustoleum has far more coverage, at a guess the Tal-1 has a tube diameter of around 0.12m and a length of around 0.8m giving you roughly 0.3m sq surface area.

One can of Rusty will do 4 or 5 light coats.

[astrodan]

Yes, I'd read the can labels, and am aware of the geometry, but firstly, I was gong to follow Astrobaby's recommendation of 3 coats of Rustoleum white on the main tube and finder, and 5 coats of the Hammerite black on the mount (and possibly the 3 legs, although she didn't specifically mention those (yet?)), and secondly the manufacturer's estimates, assuming they haven't been exaggerated, would probably not allow for the following. A relatively small curved object like a tube is going to have continuous overspray compared to a flat surface like a car door, and a small complex shape such as the mount is going to have huge overspray, as are the open truss legs, perhaps 50% wastage. That's why I'd value someone else's experience.

Davey-T - that's interesting to hear, although I thought the mount didn't look you could roll it. I'll try a small roller on the first coat. PS my border collie lady is chuffing at me as I type -walkies!

DaveL59 - Powder coating would be very nice and hardwearing, but yes, probably pricey, and I agree, doing it yourself is the best.

Thanks guys,

Danny

[Davey-T]

2 hours ago, astrodan said:

Davey-T - that's interesting to hear, although I thought the mount didn't look you could roll it. I'll try a small roller on the first coat. PS my border collie lady is chuffing at me as I type -walkies!

I meant buy a small can of ordinary Hammerite brushed on.

Dave

[astrodan]

Yes so did I, esp. as a tin of paint is better value than a spray can 🔭👍

Thnx again,

D