I think it's pretty hard to keep paint on teak . The oil in teak is always trying to come to the top and it wants to push the finish off . Maybe if the first couple coats of primer are thinned way down like you do when varnishing that might help . When varnishing teak I've always tried to get the oil to lay down long enough for the first coat to penetrate good and dry before the oil has time to push it off . I usually clean raw teak with acetone first and then get a thin coat on right away , but I've never painted teak . This is just what I do .I can't claim that it's the right way but so far it has worked for me.
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Marty
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