swift1894 Posted April 28, 2016 Report Share Posted April 28, 2016 For sanding down paintwork are the round disc types superior to the rectangular pad types? Link to comment Share on other sites More sharing options...
W+T Posted April 28, 2016 Report Share Posted April 28, 2016 (edited) For sanding down paintwork are the round disc types superior to the rectangular pad types? yep i have used all types and a DA sander with good quality pads are the best way to go, I have a cheap Skil 115mm DA sander and is great. EDIT, that is if you are on about sanding down a sewer tube shell, not finer areas. Edited April 28, 2016 by W+T Link to comment Share on other sites More sharing options...
dave moore Posted April 28, 2016 Report Share Posted April 28, 2016 Another vote for the DA sander, widely used by most boat painters. I've had my Bosch for years, uses standard 150mm ( 6" ) discs. Cracking tool. Dave Link to comment Share on other sites More sharing options...
by'eck Posted April 28, 2016 Report Share Posted April 28, 2016 Yes I think thread title should read random or dual action orbital sander to leave finer finish without rings. Link to comment Share on other sites More sharing options...
fudd Posted April 28, 2016 Report Share Posted April 28, 2016 Don't forget proper dust extraction. The discs last much longer and so will your lungs. Link to comment Share on other sites More sharing options...
swift1894 Posted April 28, 2016 Author Report Share Posted April 28, 2016 Yes I think thread title should read random or dual action orbital sander to leave finer finish without rings. I've googled random and dual action sanders and they look the same. What's the difference? Link to comment Share on other sites More sharing options...
by'eck Posted April 28, 2016 Report Share Posted April 28, 2016 I've googled random and dual action sanders and they look the same. What's the difference? There isn't any, I was simply giving the two common titles to the same product. Often they are used together in describing a single product - guess it sounds better Link to comment Share on other sites More sharing options...
Robbo Posted April 28, 2016 Report Share Posted April 28, 2016 I've googled random and dual action sanders and they look the same. What's the difference? I think with DA's the random bit doesn't rely on the rotation as its forced. Link to comment Share on other sites More sharing options...
swift1894 Posted April 28, 2016 Author Report Share Posted April 28, 2016 (edited) I think with DA's the random bit doesn't rely on the rotation as its forced.Yes but I wanted to know if they were better than the rectangular sanders which don't spin round like the discs.The rectangular sander have a tiny radius of rotation so, I imagine, leave a finer finish. Do the DAs leave a finish good enough to apply a top coat or would a primer/base coat be required? Edited April 28, 2016 by swift1894 Link to comment Share on other sites More sharing options...
bag 'o' bones Posted April 28, 2016 Report Share Posted April 28, 2016 (edited) Yes but I wanted to know if they were better than the rectangular sanders which don't spin round like the discs. The rectangular sander have a tiny radius of rotation so, I imagine, leave a finer finish. Do the DAs leave a finish good enough to apply a top coat or would a primer/base coat be required? Da's are used in car body shops so I imagine so. I've got a small air powered one which leaves a perfectly acceptable finish. Also depends on grit grade. Its not advisable to apply a top coat directly over old paint without a primer/undercoat. Edited April 28, 2016 by bag 'o' bones Link to comment Share on other sites More sharing options...
swift1894 Posted April 28, 2016 Author Report Share Posted April 28, 2016 Its not advisable to apply a top coat directly over old paint without a primer/undercoat. Why is that? Link to comment Share on other sites More sharing options...
dave moore Posted April 28, 2016 Report Share Posted April 28, 2016 DA or random orbit sanders are widely used in the boat painting business, of which I'm part. The discs are bought as a separate disposable item, usually in boxes of 100. Coarser grits, say 80 , 120 are used for paint removal, mediums such as 240 and 320 give a finer finish, whilst 400 to 600 or higher can be used prior to final coats. Undercoats provide an appropriate block of colour for topcoats. Depending on the colour, some glosses need several coats to achieve opacity. Midnight blue, popular with boaters, is a prime example. With a fine enough disc you needn't worry about marks from DA sanders, vastly superior to the rectangular job bites. I'm happy to speak if it helps. If so, PM me for numbers. Dave Link to comment Share on other sites More sharing options...
Nightwatch Posted April 28, 2016 Report Share Posted April 28, 2016 I have a Bosch orbital sander, the non professional colour. Had it more than twelve years. Sanded a narrowboat and ample wood jobs over the years. Needed a new 'velcro' pad recently. Easy to buy,easy to replace. Link to comment Share on other sites More sharing options...
bag 'o' bones Posted April 28, 2016 Report Share Posted April 28, 2016 Why is that? Apart from Daves comment that undercoats provide an appropriate block of colour for the topcoat, Repaints invariably require repairs to scatches and rust spots which are likely to 'grin through' a top coat if it is applied directly without an undercoat. The whole idea of an undercoat is to smooth the surface of irregularities. Link to comment Share on other sites More sharing options...
gazza Posted April 28, 2016 Report Share Posted April 28, 2016 Seeing as we are doing a show me yours I'll show you mine. http://www.screwfix.com/p/erbauer-erb382sdr-random-orbit-sander-230-240v/96759 2 years guarantee. Mines done loads of work, boats, plaster on house walls, flatting off 8x4 melamine coated boards at work. Ace cheap quality bit of kit. Not often those three words go together Link to comment Share on other sites More sharing options...
W+T Posted April 28, 2016 Report Share Posted April 28, 2016 Seeing as we are doing a show me yours I'll show you mine. http://www.screwfix.com/p/erbauer-erb382sdr-random-orbit-sander-230-240v/96759 2 years guarantee. Mines done loads of work, boats, plaster on house walls, flatting off 8x4 melamine coated boards at work. Ace cheap quality bit of kit. Not often those three words go together bloody nora kida,£90 aint cheap lol, well to me. good it of kit though. getting a cheap skate in me owd age Link to comment Share on other sites More sharing options...
Richard10002 Posted April 28, 2016 Report Share Posted April 28, 2016 Watch this guy's videos and do what he does http://www.johnbarnard.biz/tips-tricks-videos/ I've only done my handrails so far, but boaters in our club are very impressed. I think it's mostly due to the Craftmaster paint, but also preparation. Link to comment Share on other sites More sharing options...
gazza Posted April 28, 2016 Report Share Posted April 28, 2016 bloody nora kida,£90 aint cheap lol, well to me. good it of kit though. getting a cheap skate in me owd age I buggered up an orbital champion sander £30 and a 1/3 sheet silverline sander £15 I wished I'd got one of these to begin with Link to comment Share on other sites More sharing options...
dave moore Posted April 28, 2016 Report Share Posted April 28, 2016 I've never begrudged the money spent on quality tools. My professional Bosch DA cost £150ish 10 years or so ago but has been a pleasure to use compared the a cheaper, earlier model. One customer doing his own repaint bought an economy one from Michael Mouse Ltd, got half way through when it died. It could be me, but decent tools are usually a pleasure to use, cheapos less so. Dave Link to comment Share on other sites More sharing options...
bag 'o' bones Posted April 28, 2016 Report Share Posted April 28, 2016 Silverline tools are poor quality generally. Sanding down a boat is a big job. Cheap tools are not really designed for hard continuous use. Remember the old saying buy cheap buy twice? Link to comment Share on other sites More sharing options...
swift1894 Posted April 29, 2016 Author Report Share Posted April 29, 2016 Great info as usual. Thanks everyone Link to comment Share on other sites More sharing options...
Sea Dog Posted April 29, 2016 Report Share Posted April 29, 2016 It could be me, but decent tools are usually a pleasure to use, cheapos less so. Dave T' isn't just you Dave. "Buy the best - cry only once" is probably more true of tools than it is anything. Link to comment Share on other sites More sharing options...
gazza Posted April 29, 2016 Report Share Posted April 29, 2016 John Ruskin:- It's unwise to pay too much, but it's worse to pay too little. When you pay too much, you lose a little money - that's all. When you pay too little, you sometimes lose everything, because the thing you bought was incapable of doing the thing it was bought to do. The common law of business balance prohibits paying a little and getting a lot - it can't be done. If you deal with the lowest bidder, it is well to add something for the risk you run, and if you do that you will have enough to pay for something better Link to comment Share on other sites More sharing options...
WotEver Posted April 29, 2016 Report Share Posted April 29, 2016 Love it Gazza Link to comment Share on other sites More sharing options...
gazza Posted April 29, 2016 Report Share Posted April 29, 2016 Thats up on our notice board in the office, The MD takes no notice of it though..... Link to comment Share on other sites More sharing options...
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