Mildew Stain Blocker Products - Too Good To Be True?

[Tooncrazy]

I like to prevent problems rather than treat them.

Has anyone here used this "Mildew Stain Blocker" product. Only 8 reviews on Amazon (new product?): http://www.amazon.com/Star-brite-Mildew-Blocker-Barrier/dp/B00EXIVVU8/ref=sr_1_2?ie=UTF8&qid=1429711219&sr=8-2&keywords=starbrite+mildew

Does it work?

Is it compatible with 303 products?

Their "Mildew Stain Remover" gets great reviews (47) on Amazon: http://www.amazon.com/gp/product/B001446IYI/ref=ox_sc_sfl_title_2?ie=UTF8&psc=1&smid=A1YUR915BM42I1

EDIT:

Has  anyone here used this 3M Marine Mildew Block product, reviewers on Amazon seem to like this one too:

http://www.amazon.com/gp/product/B000BEXWVY/ref=pd_luc_rh_sbs_02_01_t_ttl_lh?ie=UTF8&psc=1

 

[keithkz]

No but I've used their mildew removal product (yellow label) and was completely unimpressed.