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-   -   Downdraft paint booth (https://vansairforce.net/community/showthread.php?t=143262)

BigD'sRV14 10-30-2016 05:04 PM

Downdraft paint booth
 
Hello all. I am looking for information I saw regarding building a small downdraft paint booth with chicken wire on top. It used HVAC filters avaliable at a hardware store. thanks

wirejock 10-30-2016 05:59 PM

Booth
 
Quote:

Originally Posted by BigD'sRV14 (Post 1122976)
Hello all. I am looking for information I saw regarding building a small downdraft paint booth with chicken wire on top. It used HVAC filters avaliable at a hardware store. thanks

I built one from hobby board with a child gate as the spray table. Works great. Easy to modify and build from 1/4" ply almost any dimension. Blower is a Rule 240 bildge blower plumbed to a wall dryer vent. It's documented in my blog. Fuse page.

rv7charlie 10-30-2016 06:07 PM

An old aluminum window screen works great as a spray surface, too, and small parts won't fall through.

leok 10-30-2016 07:06 PM

This is the downdraft table I built. It has worked well for me.



It is a 2x4 frame wrapped with a blue tarp. The top is plastic mesh fencing. The ends have 20 inch box fans with furnace fans duct taped over them. It has the advantage of being easy to take down and store when not in use.

PilotFuse 10-30-2016 07:46 PM

Quote:

Originally Posted by leok (Post 1123014)
This is the downdraft table I built. It has worked well for me.



It is a 2x4 frame wrapped with a blue tarp. The top is plastic mesh fencing. The ends have 20 inch box fans with furnace fans duct taped over them. It has the advantage of being easy to take down and store when not in use.

Total newbie here. Why are the fans necessary? Ventilation?

DaleB 10-30-2016 07:50 PM

I used a shortened fuselage shipping crate. Wire mesh on top, a furnace filter and 20" box fan screwed to the bottom. I used the cut out piece from the fan opening spaces off the floor of the box with short pieces of 2x4 to keep some of the spray out of the filter. It worked pretty well.

wirejock 10-30-2016 07:58 PM

Exhaust
 
Quote:

Originally Posted by PilotFuse (Post 1123019)
Total newbie here. Why are the fans necessary? Ventilation?

They are exhausf fans. I suggest intrinsically safe or squirrel cage. If you use box fans, use them to blow so volitile fumes are not passing through them.

PilotjohnS 10-30-2016 09:16 PM

My plan
 
My plan is to build a simple 4' x 2'x 2' box out of 1" pvc and 6 mil plastic tarp. I will use a 20 " box fan from walmart and hpa furnace filter. I plan to suck air down when priming then flip the fan around and blow air up thru the grate ( and filter) when drying to keep the bugs off, if needed. This will be for primer only. And i hear primer drys pretty fast. I was going to make the front to back pvc pipes removable so that i can break it down to store.

leok 10-31-2016 04:53 AM

Quote: They are exhausf fans. I suggest intrinsically safe or squirrel cage. If you use box fans, use them to blow so volitile fumes are not passing through them.

I should have mentioned, I used Stewart Systems water based primer exclusively. No worries on flammability.
Without the fans on, overspray will come back up through the mesh contaminating the shop.

1001001 10-31-2016 05:55 AM

Here is mine:

http://www.brunbergs.net/?p=296
http://www.brunbergs.net/?p=318

It's mostly good for small parts. You probably want a bigger surface like the 2x4 frame shown in another post above.

MJarreau 10-31-2016 07:27 PM

What about side 2?
 
All of this makes good sense to me but I'm a little slow....

After painting/priming side one, do the parts get flipped to allow for the opposite side to be painted/primed? Are they allowed to dry and then flipped and painted/primed?

leok 10-31-2016 07:32 PM

Quote:

Originally Posted by MJarreau (Post 1123303)
All of this makes good sense to me but I'm a little slow....

After painting/priming side one, do the parts get flipped to allow for the opposite side to be painted/primed? Are they allowed to dry and then flipped and painted/primed?

Yes and yes
For external skins I only primed the internal side. I also chose to not prime the exposed side of the floor panels since they will be covered with carpet.

DaleB 10-31-2016 08:47 PM

I used mine with both Stewart systems waterborne primer and Shopline epoxy primer. Both of them dried in only a couple of minutes with the downdraft, quickly enough that I could flip them over and paint both sides

BillL 11-01-2016 05:24 AM

Quote:

Originally Posted by leok (Post 1123062)
Quote: They are exhausf fans. I suggest intrinsically safe or squirrel cage. If you use box fans, use them to blow so volitile fumes are not passing through them.

I should have mentioned, I used Stewart Systems water based primer exclusively. No worries on flammability.
Without the fans on, overspray will come back up through the mesh contaminating the shop.

And will blow up trash from the box back onto your pretty paint. at least mine did

PilotjohnS 11-01-2016 10:21 AM

Never thought of that
 
Quote:

Originally Posted by BillL (Post 1123360)
And will blow up trash from the box back onto your pretty paint. at least mine did

I was going to flip the fan around for cure and blow clean air up thru filter. But you are right, all that trash comes back. It seems primer dries so fast it probably is not worth the trouble. Thanks for the insight.

az_gila 11-01-2016 11:14 AM

Quote:

Originally Posted by DaleB (Post 1123327)
I used mine with both Stewart systems waterborne primer and Shopline epoxy primer. Both of them dried in only a couple of minutes with the downdraft, quickly enough that I could flip them over and paint both sides

Same with the AKZO primer. It dries pretty quickly but takes a while to actually cure.

If you are careful, gently flipping the parts over after 5 minutes or so is easy and lets you prime both sides with one load of the paint gun.

BigD'sRV14 11-01-2016 07:34 PM

Small parts paint booth
 
Thanks all for great ideas. Will put one together soon


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