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Discussion Starter · #1 ·
Can I get some quick advice. Is it OK to seal a routed track in PVA? And if so, what kind of PVA to water mixture should I do?

I put a magnetic paint coat down yesterday, waited 10 hours, then put down a top coat of water based grey paint. For some reason, the magnetic paint does not appear to have cured (felt fine to paint over, and time between coats is 3 hours according to the tin) and the water based top paint can scratch off quite easily.

I'm painting road markings and skid marks today, with the intention of doing copper tape tomorrow or Sunday. Before doing the tape I need to decide if PVA would work, otherwise I fear the paint will chip and scratch in use.

Thank you
 

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Discussion Starter · #4 ·
Thanks for the fast replies. Another coat isn't really viable as I've spent all day detailing the track, so it looks like asphal. Would have to said it down to add another coat


Will the magnetic paint (which is solvent based) cure even under the water based paint if I leave it long enough? I don't think it will. I've done a test and scratched off the water based paint (it won't scratch off on areas without the magnetic paint) and the magnetic paint is tacky!

I'm not very happy


There must be something I can coat everything with to seal it. Just how "grippy" would PVA be if it was really diluted?
 

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Discussion Starter · #15 ·
Thanks for all the advice guys.

I put on two coats of magnetic paint, which was pretty much the whole 750ml tin. Simple tests show it to have just about no effect, so yeah I too am convinced it was a waste of time and money. If I'd done 5 or 6 coats it may of been different.

The best bet right now appears to be wait and see. I'll carry on detailing and won't tape it for at least a few days. It's not like there isn't a hundred and one other things to be getting on with on the track. I'll do some tests in a few days to see if it still scrapes easily, I'm hoping the water based paint it porous enough to allow the solvent paint under it to cure.

Thank you all so much for the advice. This track has proved to be such a time eater, there's just one issue after another and this paint issue freaked me out. I'll let you all know what the situation is in few days time
 

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Discussion Starter · #21 ·
QUOTE (GT40's @ 13 May 2011, 23:12) <{POST_SNAPBACK}>Just another note on aplying copper tape on PVA paint ,in hindsight and for future Ill try some sticky glue before putting down the tape as its more likely to come off or wrinkle due to wheather changes on a phorus PVA than on latex paint.

That's interesting. I'll put a thin coat of PVA around the slot before applying the tape then. I'm already going to use a bit of mixed down PVA (probably 1:3) to keep the tipex-roller white lines in place. I'll get that done tomorrow, maybe start on some of the rocks. No taping until Monday at the earliest, depending on the paint.

Polyurethane has been suggested as an all-over coat. I'm loathe to do any more than is needed, and I don't want to keep spending money either, so a Wait And See approach is best. I do have to have it up and running by middle of next week, I promised my son it would be running by the Thursday....
 

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Discussion Starter · #23 ·
At the moment it's simply MDF, a coat of water based primer, 2 coats of solvent based magnetic paint, then another coat of water based primer over that. The PVA coat isn't going to happen as apparently that's not the best, and urethane is unlikely as well. As long as the solvent paint can cure under a coat of water based paint (I forgot to mention it's primer earlier) then I think I'm good.
 

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Discussion Starter · #28 ·
QUOTE (sacesta @ 14 May 2011, 20:30) <{POST_SNAPBACK}>I put down 3 coats of Rustoleum magnetic primer on my track followed by 2 coats of flat latex. If there is any magnetic downforce it is probably negligible. I can't feel the downforce holding the car just above the track but I can feel slight downforce if I hold the car's magnet alone just above the track. The magnetic primer does give the track a bit of texture that seems very realistic to me. Cars handle well with silicone Slot-It S2s or Super Tires.

I can't feel any pull by lifting the car from the track, but just sliding the magnet along itself, it sticks quickly to the areas with the magnetic paint. So I guess it's going to do something. I've "speckled" the track so it has quite a bit of texure now
 

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Discussion Starter · #29 ·
QUOTE (John Cahill @ 14 May 2011, 10:07) <{POST_SNAPBACK}>hi, Chain
ok, so water-based primer/magnetic solvent-based/water-based primer...as long as that solvent-based middle layer has time to off-gas I think you're golden (although that's a big if...getting through the latex will be tough, and a heat gun could be a consideration since you have a deadline *grin*). Fwiw...assuming the "water based" primer is actually acrylic latex...which is fairly typical...then the primer is exactly the same composition as the topcoat itself . With acrylic latex the only reason it's called a primer is because the tinting is useful as an undercoat or it has special properties like an anti-mold additive (and of course this isn't true of all paints..in many cases it literally is a primer which aids adhesion between the base material and topcoat).

Also, I just wanted to add to my earlier comment. Personally I have acrylic latex, copper tape and urethane tires. I really like that combination and would recommend it to you. My mention of using steel braid was only if you are sure you want some downforce. Wood tracks are surprisingly smooth...and IMO work just fine without downforce. But obviously that's in the eye of the beholder.

Good luck with your paint and overall project...hopefully it will reward you with many years of grins and memories with your son!

John

Thanks for the detailed post John
I considered magnabraid initially, but the cost was too high. I like the idea of magnetic paint distributing the down pull across the width of the track rather than just the rails.

I don't have a heatgun, but I'll be out tomorrow with a hairdryer trying to speed things up
 

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Discussion Starter · #30 ·
Not had the time for the heating the paint yet, been doing FRocks all day, but the paint is definitly curing
Very noticeable in some areas, not in others, but I have little doubt now that given enough time, all will be well. I'm going to try putting the tape down tomorrow, but may wait until Tuesday.
 

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Discussion Starter · #32 ·
LOL yeah. Trying to be optimistic, I've been working on it solidly the last 5 days yet it's still nowhere near. Maybe the tape can wait until Tuesday.... I have a few spare metres of tape with conductive sealant so I can splice any areas easily enough.

I said earlier everything is curing, but then later I took a big chunk of top coat off when the staple gun caught it. Hairdryer tomorrow I think.
 

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Discussion Starter · #34 ·
Good to know I'm not the only one who has struggled with this!

The track is in the shed. It can get very hot in there in the summer, far too hot to stay in the shed, so that should do it. Just started getting sunny again today, so if things hold up it should be fine


Matt
 

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Discussion Starter · #35 ·
I'm delighted to say the paint is now pretty much 100% there
There are still one or two areas where it's not completely cured, but these are improving daily. I have no doubt it's all going to be fine now. Taken a long time, but an important lesson learnt and hopefully of use to other people in the future - if you're putting on magnetic paint, give it a week or so to cure properly before putting on the top coat!

Thanks to everyone for the help, suggestions and support
 
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