Hello to all,
Concerning primer – once applied does it need to be topcoated within a certain time?
A painter once told me that the purpose of primer is to bond to the substrate and to allow the finish coat to bond to it. After a period of time the primer loses its tackiness and must be reapplied.
The reason for this question is that I am installing some preprimed doors. When I prime the raw edges (where planed or routed) the paint seems to stick better to the freshly primed areas than to the “factory” primed areas which could have been primed months ago.
Any thoughts.
Thanks.
Replies
I have read on some cans of primer that it needs to be topcoated within 30 days. I believe the reason for this is that primer is made to stick hard to the substrate, but that property comes at a trade off. Primers are not formulated to resist weathering and ultraviolet radiation as topcoats are, so they will deteriorate fairly quickly compared to topcoats.
I don't know if the paints used for factory pre-priming are different from the ordinary primers available in paint stores.
if the doors are outside, definately finish within a month...if the doors are inside , not an issue... preprimed wood doors are not my favorite. they apply a quick dry primer, which does not penitrate properly...also very brittle, an issue outside. regardless, clean thoroughly, lightly sand, if necessary reprime...good luck
jpa