Trailer surface preparation

My plan is to remove patches of algae embedded in the GRP surface before
painting. So far, i`ve rubbed/cleaned down the surface as much as I can
using wire brush and glasspaper. Any ideas on the most effective product
to use please?

On Friday, July 29, 2016 at 3:30:06 AM UTC-5, Colin Roney wrote:
My plan is to remove patches of algae embedded in the GRP surface before
painting. So far, i`ve rubbed/cleaned down the surface as much as I can
using wire brush and glasspaper. Any ideas on the most effective product
to use please?

West Marine sells a mildew/algae and stain remover that works.

Chlorine Dioxide used on AC units would probably be good if it will not harm fiberglass. ALso could use UV lights used in AC units and duct work to kill mildew, mold and bacteria.

Cheap easy, green Scotchbrite and a dilute mixture of water and chlorine (with some dish soap). Wash a couple of times to remove chalked Gelcoat as well as biologics.
Yes, the marine group has stuff to do similar, not sure how easy it is to find locally or the cost.

Many thanks for the very helpful contributions.





At 01:16 30 July 2016, Charlie M. UH & 002 owner/pilot wrote:
Cheap easy, green Scotchbrite and a dilute mixture of water and chlorine
(with some dish soap). Wash a couple of times to remove chalked Gelcoat
as
well as biologics.
Yes, the marine group has stuff to do similar, not sure how easy it is to
find locally or the cost.

I use "Wet and Forget" on my shingle roof, soffits, garage door, and concrete drive. Each time it rains it cleans. I've used Simple Green on aluminum camper to clean mildew and also on the rubber roof. In early '90's, the Gov bought Simple Green by the 55 gal drum. Don't use AJAX bleach alternative on fiberglass. It will dry it out. It cleans good and maybe ok if you rinse very well then paint. But I would use Simple Green.

I don't know why Cobra uses the gelcoat they do. Maybe more flexible than what boat manufactures use. But I've seen boats out in the sun twice as long as a cobra trailers and looked twice as good. Maybe glider pilots don't wax their trailers. To me, Cobra trailers look more porous than boat gelcoat and oxidize way too quick for what they cost. And I have always wondered why an Aluminum cobra trailer top is a different white than the bottom. I like Cobra trailers, but maybe because there is not much competition. But they cost way to much.

I just ran across this that looks promising: http://www.biokleen.com/hull-cleaner

I noticed you said glasspaper instead of sand paper so you are probably not in US where some of these products are available. Since you are going to paint and have used a wire brush, something harsh like the AjAX bleach alternative or something like toilet bowl cleaner or muriatic acid may work but I would rinse very well. People use toilet bowl cleaner, or hull cleaner, or muriatic acid on boats to remove stains.

Good luck.

On the advice of a club member I finally chose a solution of ARIEL washing
powder which contains bleach and the use of a stiff brush.

At 11:19 31 July 2016, Casey wrote:
I use "Wet and Forget" on my shingle roof, soffits, garage door, and
concre=
te drive. Each time it rains it cleans. I've used Simple Green on
aluminu=
m camper to clean mildew and also on the rubber roof. In early '90's,
the
=
Gov bought Simple Green by the 55 gal drum. Don't use AJAX bleach
alternat=
ive on fiberglass. It will dry it out. It cleans good and maybe ok if
you=
rinse very well then paint. But I would use Simple Green. =20

I don't know why Cobra uses the gelcoat they do. Maybe more flexible
than
=
what boat manufactures use. But I've seen boats out in the sun twice as
lo=
ng as a cobra trailers and looked twice as good. Maybe glider pilots
don't=
wax their trailers. To me, Cobra trailers look more porous than boat
gelc=
oat and oxidize way too quick for what they cost. And I have always
wonder=
ed why an Aluminum cobra trailer top is a different white than the
bottom.
=
I like Cobra trailers, but maybe because there is not much competition.
B=
ut they cost way to much.

I just ran across this that looks promising:
http://www.biokleen.com/hull=
-cleaner

I noticed you said glasspaper instead of sand paper so you are probably
not=
in US where some of these products are available. Since you are going
to
=
paint and have used a wire brush, something harsh like the AjAX bleach
alte=
rnative or something like toilet bowl cleaner or muriatic acid may work
but=
I would rinse very well. People use toilet bowl cleaner, or hull
cleaner,=
or muriatic acid on boats to remove stains.

Good luck.

On Monday, August 1, 2016 at 4:31:01 PM UTC-4, Colin Roney wrote:
On the advice of a club member I finally chose a solution of ARIEL washing
powder which contains bleach and the use of a stiff brush.

Thats probably fine for the algae and using plenty of water to rinse. I would use a self etching primer prior to painting. Then any automotive paint.

1975 trailer: https://dl.dropboxusercontent.com/u/...1/DSC00425.JPG

On Monday, August 1, 2016 at 4:31:01 PM UTC-4, Colin Roney wrote:
On the advice of a club member I finally chose a solution of ARIEL washing
powder which contains bleach and the use of a stiff brush.

Thats probably fine for the algae and using plenty of water to rinse. I would use a self etching primer prior to painting. Then any automotive paint.

1975 trailer: https://www.dropbox.com/sh/9icgfg36j...qIC_8cAVa?dl=0

On Monday, August 8, 2016 at 8:14:12 PM UTC-4, Casey wrote:
On Monday, August 1, 2016 at 4:31:01 PM UTC-4, Colin Roney wrote:
On the advice of a club member I finally chose a solution of ARIEL washing
powder which contains bleach and the use of a stiff brush.

Thats probably fine for the algae and using plenty of water to rinse. I would use a self etching primer prior to painting. Then any automotive paint.

1975 trailer: https://www.dropbox.com/sh/9icgfg36j...qIC_8cAVa?dl=0

Self etching primer is used for metal but I doubt it would have any useful benefit on a composite trailer.
UH