The verb colorir shows as regular on duo

http://www.duolingo.com/word/pt/colorir/Verb

but appears to be defective on other sites.

Here it is defective in the first person singular.

http://www.fpepito.org/verbos/conjugue.php?verbo=colorir

Here it only has nós and vós forms

http://www.conjuga-me.net/en/verbo-colorir

and

http://conjpt.cactus2000.de/showverb.en.php?verb=colorir

Does anyone agree on how it should be conjugated?

And how do you work around the defective forms?

Would you really not say "Eu coloro a garrafa" when you can say "Nós colorimos a garrafa."?

Would you say "Eu estou colorindo a garrafa" ?

I'm puzzled as to why such a normal looking word ended up being defective.

Thanks:)