HP Forum Archive 14

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Topcat restorations Message #1 Posted by Randy Sloyer on 24 Dec 2003, 10:12 a.m. I finally bought a 97 to restore for my collection. Do I need it? Of course not. Did I want one? Well, after I fixed a 92 for a guy a while back - that set the hook. After playing with it for a while, I had to have one. Heh Norm, yeah, leds are cool, but BIG leds are even cooler!!! Everything is now working but in trying to get some pencil marks off the bezel (previous owner numbered all the rows and columns) I've ended up with some shiny spots. I guess some are from wear as well. So here's the question: Has anyone come up with a good way to restore the nice original matte finish of the keyboard area? I've thought of trying some photo dulling spray (it's acrylic I think) but did want to jump that way just yet. Any success stories out there?

Re: Topcat restorations Message #2 Posted by David Smith on 29 Dec 2003, 1:43 p.m., in response to message #1 by Randy Sloyer I have worked on zillions of these machines and have never found a way to restore a worn keyboard background. You can sometimes improve them quite a bit by cleaing off as much dirt as possible with Windex. Armor All can also help... it is particularly good at removing white oxidation stains.

Re: Topcat restorations Message #3 Posted by Paul Brogger on 29 Dec 2003, 4:04 p.m., in response to message #2 by David Smith IIRC, there is a "satin finish" style of Armor All. I doubt it will make much difference, but you might try it. I used "regular" Armor All on my -97 -- every plastic piece, inside & out. I don't think it covered up any keyboard wear, but the whole thing ended up looking better, and I suspect the plastic will last longer after having drunk up some fresh petrochemicals . . . I've evened up (and created) "studio finish" on guitars by using triple-ought or four-ought steel wool. But that sounds a bit harsh, and you wouldn't want to go NEAR any of the yellow lettering! (Not to mention, steel wool and electronics are, like, mortal enemies!) There's an enamel finish intended for military modellers, called "Dullcote" (from Testor's, I think). There are also matte fixatives (for artists) that might work. You should first experiment with any of these on a junk Pioneer, as well as on a patch of the inside of the -97's faceplate. I would, however, NOT use Armor All until I'd ruled out later use of something like Dullcote! (I suspect that enamel wouldn't adhere as well to an Armor All'd finish.) But, I'm no expert -- perhaps a chemist will chime in?

matt painted surfaces... Message #4 Posted by Hans Brueggemann [GER] on 29 Dec 2003, 4:19 p.m., in response to message #1 by Randy Sloyer Randy, maybe, you want to give this one a try: http://www.swannysmodels.com/TheCompleteFuture.html , especially the combination of flat paint and future. cheers, hans

There should be such a spray-can Message #5 Posted by Norm on 30 Dec 2003, 5:32 p.m., in response to message #4 by Hans Brueggemann [GER] Hi, I think that you could do OK just going to Home Repot and getting "Varathane Spray Varnish" and you'd probably go with the matte version. It's available in gloss, semigloss, and matte. Now, don't overrate my suggestion..... probably eventually the varathane varnish would peel off. It also might wear fairly quickly. Nevertheless, it's in the ballpark of what you are saying you want to do (eliminate worn shiny spots). The real test is your own skill applying it..... personally I could never do a good job with spray cans, but I've seen other people who do perfect work. What you could do, is use this item as a baseline beginning (maybe buy a can, try it on something unimportant like an HP-49G+ or an HP laptop) then you could continue by visiting a hobby shop, saying "i want something tougher than this, maybe an epoxy enamel" etc etc

Re: There should be such a spray-can Message #6 Posted by David Smith on 31 Dec 2003, 1:17 p.m., in response to message #5 by Norm How would one spray the keyboard bezel without messing up all the keys? And you thought it was bad when you painted a window shut...

Well, you gotta take it apart Message #7 Posted by Norm on 31 Dec 2003, 6:29 p.m., in response to message #6 by David Smith Well, you gotta take it apart before you spray it. I mean, that's just the way it is. It's about getting your steps into the right order. You'd have to take away everything that you don't want the spray material to go onto. That means take it apart, and then some. Like, if Detroit wanted to dip a car into a pool of paint, which they do, they have to make sure that it's just the basic metal shell. They don't put in the car stereo and the seats until AFTER the shell has been thru the paint pool. You would not want to buy the car if they assembled all the seats and the rug and the radio into it, and THEN they dipped it into the paint pool. Same with the calculator.

Re: Well, you gotta take it apart Message #8 Posted by Hans Brueggemann [GER] on 1 Jan 2004, 2:28 p.m., in response to message #7 by Norm yes, i agree. i was lucky with my 34C (2101 build): the keyboard faceplate (not the metallic one, but the grey plastic sheet version) went off with the help of a toothpick and caught no kinks or wrinkles, because the self-adhesive foil on the back side did no longer stick to the plastic sheet. however, it was a pain to remove all foil residues from the upper chassis half. (i am not going to do it this way again. i think, it is much easier and less risky to remove the circuit assembly and all buttons). however, the question remains: what clear varnish with a "silk" matt appearance will stand the continuous wear by fingerprints? at the moment i am experimenting with a mixture of 50% "future" and 50% acrylic water based matt clear varnish. if that tests o.k., i'll be dropping you a note. so far, my knowledge is that *enamel* modelling paint (such as humbrol and the like) definitely does *not* withstand the fingerprints, but will get sticky and shiny after a short time of use (wear). it also is not scratch-resistant. cheers, hans

Re: Well, you gotta take it apart Message #9 Posted by Stefan Vorkoetter on 2 Jan 2004, 8:23 p.m., in response to message #8 by Hans Brueggemann [GER] Just a thought. Has anyone tried a finish called Fabulon? It's a semi-gloss floor finish, which is way more durable than polyurethane (and it smells much worse too, but unlike urethane, it dries completely overnight). PS. I haven't tried it for this, so I don't know if it would harm the existing finish.

interesting. where to buy?? (n.t.) Message #10 Posted by Hans Brueggemann [GER] on 3 Jan 2004, 7:14 a.m., in response to message #9 by Stefan Vorkoetter .

Re: Well, you gotta take it apart Message #11 Posted by David Smith on 2 Jan 2004, 11:58 a.m., in response to message #7 by Norm Although you can remove the HP97 key tops from the keyboard, it is not recommended. You can probably get a lot of them off without breaking the little ball on the end of the key shaft, but I suspect that you can't get them all off intact. Also there is a good chance that some of the little "hats" will not stay on once you re-install them... this can be fixed with a little IC2000 glue.

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