barneybrendan Posted September 1, 2011 Share Posted September 1, 2011 the car is starting to look tatty so i want to get it in primer.What is the best primer to use ,and do you use the same primer on the fibreglass and plastic.I need to spray my bumper,mirrors and ridox wings to start with.Would it be best to use some sort of high build primer as the bumper needs building up . Quote Link to comment Share on other sites More sharing options...
Noz Posted September 1, 2011 Share Posted September 1, 2011 best to use a standard base coat primer first mate. it sticks to metal and plastic better. high build primers aren't particullary good at being a base coat to stick whatever your spraying onto. some stay slightly soft as well. if your going to use filler primer, use it as a second or third coat. get some base primer (like stock grey thinner primer) first. try and use build primer as a filler, as its never a good base and you want your last coat of primer to be relative to that colour, e.g. grey primer with black, red with yellow etc etc. if you use build primer without a base its a bitch when you sand it as it just comes off in lumps if you use an abrasive material. you got a compressor? should be able to use the same primer for fibreglass, plastic or metal, due to the fact your spraying on the gel coat rather than the fibreglass resin. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 1, 2011 Author Share Posted September 1, 2011 Thankyou fiew coats of standard primer first then Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted September 1, 2011 Share Posted September 1, 2011 i dont really agree with what Noz is saying. use a decent high build primer from the start it will be better and once cured you can attend to little pin holes/imperfections after using a decent acrylic based stopper... then prime again Quote Link to comment Share on other sites More sharing options...
Noz Posted September 1, 2011 Share Posted September 1, 2011 http://www.mig-welding.co.uk/primer.htm quote from Car Primers and Guide Coat Flatting: High Build primer High build primer forms a thick coat of paint that is suitable for sanding. It is not suitable for applying straight onto bare metal (it would flake off). Cellulose and 2 pack high build primers are commonly used in the UK. In the US it is common to use epoxy based primer. Quote Link to comment Share on other sites More sharing options...
Noz Posted September 1, 2011 Share Posted September 1, 2011 use the build primer as an in-between layer Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted September 1, 2011 Share Posted September 1, 2011 been doing this long enough to know what im talking about. just helping out. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 1, 2011 Author Share Posted September 1, 2011 Cheers Quote Link to comment Share on other sites More sharing options...
Noz Posted September 1, 2011 Share Posted September 1, 2011 been doing this long enough to know what im talking about. just helping out. just giving my opinon on what i learnt mate Quote Link to comment Share on other sites More sharing options...
merckx Posted September 1, 2011 Share Posted September 1, 2011 best to use a standard base coat primer first mate. it sticks to metal and plastic better. . No acid etch primer on bare metal? http://www.mig-welding.co.uk/primer.htm quote from Car Primers and Guide Coat Flatting: High Build primer High build primer forms a thick coat of paint that is suitable for sanding.It is not suitable for applying straight onto bare metal (it would flake off). Cellulose and 2 pack high build primers are commonly used in the UK. In the US it is common to use epoxy based primer. Isn't it saying that a high build primer isn't suitable for bare metal so you would use acid etch primer? Quote Link to comment Share on other sites More sharing options...
Scott Posted September 1, 2011 Share Posted September 1, 2011 Whats with all the metal discussion? Is it not for plastic and fibreglass? High build should be fine directly onto both I would have thought? Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 1, 2011 Author Share Posted September 1, 2011 Whats with all the metal discussion? Is it not for plastic and fibreglass? High build should be fine directly onto both I would have thought? It certianly is as stated just for the fibreglass /plastic parts Quote Link to comment Share on other sites More sharing options...
Scott Posted September 1, 2011 Share Posted September 1, 2011 It certianly is as stated just for the fibreglass /plastic parts Yeah, dont worry about it then mate. As Rob said, high build is fine. The only time things need to be done different is when spraying bare metal, I found that one out the hard way lol. Remember to give it a little key before you start, to give the high build something to bite into. Quote Link to comment Share on other sites More sharing options...
evinX Posted September 1, 2011 Share Posted September 1, 2011 Id get the bodywork all done, spray some 2pk grey primer on, wet flat it back going to metal if needed, then shoot some sealer primer on it, then base and clear, if its just plastic and fibreglas bits, normal primer, base and clear Quote Link to comment Share on other sites More sharing options...
scotty71 Posted September 1, 2011 Share Posted September 1, 2011 Id get the bodywork all done, spray some 2pk grey primer on, wet flat it back going to metal if needed, then shoot some sealer primer on it, then base and clear, if its just plastic and fibreglas bits, normal primer, base and clear wot no hammerite?? Quote Link to comment Share on other sites More sharing options...
merckx Posted September 2, 2011 Share Posted September 2, 2011 Whats with all the metal discussion? Is it not for plastic and fibreglass? High build should be fine directly onto both I would have thought? Merely correcting a few things already said as obviously you only need to use acid etch on metal. The high build primer will do the job fine, 2 pack will be the best but it's obviously very hazardous so I wouldn't use it unless I had a proper mask. Quote Link to comment Share on other sites More sharing options...
Scott Posted September 2, 2011 Share Posted September 2, 2011 Merely correcting a few things already said as obviously you only need to use acid etch on metal. The high build primer will do the job fine, 2 pack will be the best but it's obviously very hazardous so I wouldn't use it unless I had a proper mask. Oh no, I understood your input. I didn't get why the discussion went onto metal in the first place, it was like google copy and pasting rather than actual human input based on the query at hand Quote Link to comment Share on other sites More sharing options...
ShamelessTT Posted September 2, 2011 Share Posted September 2, 2011 Bare metal : metal etch primer, Bare plastic or when paint over existing paint (obviously having flatted /dulled it off) : plastic etch primer 2K high build primer over all of the above. We generally use adhesion promotor on most surfaces (accept metal), it helps it take well. In painting adhesion and surface prep is everything. Pro Spray or UPOL we use. Mentioned earlier in this thread was gel coat, EVIL nasty stuff....basically strip it off completely else it will react with the thinners most times in my experience. With any of the 2k stuff dont mess about, get an air fed mask, extracted booth or even better both.........or do it out side completely with a decent 3M mask. Its nasty stuff, which can screw you up for life. Quote Link to comment Share on other sites More sharing options...
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