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Post by skycheney on Apr 13, 2020 22:17:47 GMT -5
It probably can shoot gel coat, but you gotta be good on cleaning it. My friend said he shots 2part epoxy through his similar model (and then his worker didn't clean it, so he had to buy new pump guts lol). This bottom paint was shot straight from the can. I left it in overnight because it seals paint from air. The paint gun says ~2000psi maximum. It works fine for bottom paint. I use ablative, I just need to get it on the boat, it smooths out on its own. And because I knew you nay-sayers would say unpossible, I took a video! Nice work
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Post by banned on Apr 14, 2020 6:50:48 GMT -5
Can't argue with success looks like it's a lot better than rolling especially on a bottom.
Brian
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Post by krush on Apr 14, 2020 9:06:26 GMT -5
Keep distance and speed constant would make for nicer application. I have some thick spots, some thinner spots, but not really any runs. It's just hard to be consistent crawling around under the boat. But, like I said it doesn't matter....it's bottom paint and it will self polish. Just need to get it on!
Oh, going back to welders. I finally tried my HTP Mig welder on aluminum without spool gun. It does pules and works damn well! I'm decent at tig welding (thanks 2 week tig class care of union school), and it makes acceptable welds with a little bit of dime stack.
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Post by Avenger on Sept 2, 2020 10:38:36 GMT -5
I don't know if it's "must own" for everybody, but it became one for me. I ended up getting a set of refrigeration gauges. One thing I never wanted to deal with or tool up for was refrigeration. I needed repairs on things so rarely that I was perfectly content to let the pros handle it. Unfortunately, Chinese manufacturing changed all of that. Over several years now we've had a lot of our basement dehumidifiers fail. They would run a year or two and something would go wrong. Naturally, like most things today, repairing a dehumidifier that costs between $200 and $300 costs almost as much as a new unit, so our throwaway society persists. The last straw was the one we bought in 2018. A new GE with a two year warranty. POS runs for a year and craps out. Okay, no problem, it's under warranty. We just have to call GE and send them a copy of the receipt and they'll send me another one. NOPE! Wife lost the receipt. So now I have four dead dehumidifiers clogging my basement. In desperation I finally start studying about refrigeration and shopping fleabay for the tools. First set of gauges was calibrated in Celsius, which my brain does not work in, so they got returned. That and a few other issues means it's the end of August before we start work. But the good news is that after a lot of learning, careful studying of superheat tables (and interpolation because air conditioning tables don't allow for "outside" air to be around 40° Which is what the air coming off the evaporator and going into the condenser is at) we very gingerly added refrigerant a smidge at a time. Little bumps in pressure, let it stabilize, little bump etc. until we get our superheat where we think we want it. That got the frost to clear up and the unit started (pardon the expression) making water. And since we already talked about the FLIR, I brought some pictures. From the FLIRone, the evaporator and compressor before: And after: So, nice even distribution of cold now, instead of that horizontal icicle, and the compressor is running about 30° cooler. In about 24 hours it pulled five gallons of water out of the air. For a change, something seems to have gone right. Hope I didn't just put the whammy on myself. In fact, in the shop we were just discussing how things usually run the best they ever have just before they blow up. But maybe my luck will be different this time. But, on the plus side I'm pretty pleased with myself for being able to figure this stuff out and not slug the compressor. So two more units with apparently low refrigerant, and one with a locked compressor to go. Wish me luck.
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Post by yachtsmanwilly on Sept 2, 2020 14:19:41 GMT -5
Good luck! ws
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Post by skycheney on Sept 2, 2020 18:15:58 GMT -5
I started doing AC work in high school. We had the gauges and you could buy R12 at the local grocery store. That led to doing work on my dad's boat (r22) and so on. I still have that set of guages and they're probably built better than anything you can buy today. I don't have the equipment to vac down a system so I don't do too much. I have added some freon on the this boat a couple of times.
And that FLir is pretty cool
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Post by Avenger on Sept 3, 2020 5:44:53 GMT -5
The gauges are Chinese and cost about $70. I figured it wasn't going to work, so I didn't want to spend too much on future clutter. If I was serious about it I would have bought a set from Yellowjacket or similar pro-level stuff.
If I get as far as replacing the compressor on the one that locked up I was going to adapt the suction side of an air compressor to vacuum the system down. That one will be last, but we shall see. For now I'm content to just top them off and see where that goes. I'm still at a loss as to where the systems are leaking. I can't see anything that looks suspicious. No discoloration, no oil, nuttin'. I guess if they keep losing refrigerant I'll have to get a dye injection kit.
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Post by yachtsmanwilly on Sept 3, 2020 15:45:06 GMT -5
I guess I got pretty lucky once... I found a guy on C/L that was retiring and got the gages, a 2.5CFM vacuum pump and a snap on flourocarbon (freon) leak sniffer for about 75.00. If ya ever want to borrow the sniffer, sing out! ws
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Post by Avenger on Sept 3, 2020 19:38:32 GMT -5
Nice score there captain. If they keep losing refrigerant I'll be in touch. Thanks.
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Post by krush on Sept 4, 2020 18:07:38 GMT -5
Just top them off. I got all the gear, and have had it for years. I went fancy when I needed to expense some tool-toys. Appion Ion bluetooth gauges....lololol. You want a trick? Top it off with charge until you feel cold coming back to compressor in the pipe. And maybe a little bit of cold at the bottom of the compressor. If it's leaking, you can add a bit extra.
The A/C unit on this ship is being a pain in the ASS. PLC controlled electric TXV valve fucking koreans didn't program right and I don't have access to the all the parameters. A simple old school TXV and low pressure cut-out would've worked fine.
HVAC isn't that complicated...don't be scared of it. Ask questions and I can explain. If it leaks out, don't worry about vacuum.....it self purges the contaminates. LOLOLOL
Also, ditch the china shit and get a decent set of gauges that does 410a. Probably 150-200 can get you flying. Yellow jacket, etc. AMazon, or a discount tool site.
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